Latihan US Matematika Kelas Ix

1. Diagram batang berikut menunjukkan hasil penjualan mobil di sebuah dealer Selisih penjualan mobil pada bulan Februari dan Juni adalah ... unit

10

12

15

20

The diagram shows the sales of cars at a dealership. To find the difference in sales between February and June, we need to subtract the number of cars sold in February from the number of cars sold in June. The difference is 12 units, indicating that 12 more cars were sold in June compared to February.

Explanation

The diagram shows the sales of cars at a dealership. To find the difference in sales between February and June, we need to subtract the number of cars sold in February from the number of cars sold in June. The difference is 12 units, indicating that 12 more cars were sold in June compared to February.

2. Hasil dari 5 x (21 + (-7)) : ((-13)-(-8)) adalah ...

14

-14

19

-19

The given expression can be simplified step by step as follows:
1. 5 x (21 + (-7)) : ((-13)-(-8))
2. 5 x (21 - 7) : (-13 + 8)
3. 5 x 14 : (-5)
4. 70 : (-5)
5. -14

Therefore, the correct answer is -14.

Explanation

The given expression can be simplified step by step as follows:
1. 5 x (21 + (-7)) : ((-13)-(-8))
2. 5 x (21 - 7) : (-13 + 8)
3. 5 x 14 : (-5)
4. 70 : (-5)
5. -14

Therefore, the correct answer is -14.

3. Harga 1 kodi kain Rp. 300.000. Harga 10 helai kain adalah ...

Rp.135.000

Rp.140.000

Rp.145.000

Rp.150.000

The price of 1 kodi of fabric is Rp. 300,000. To find the price of 10 helai of fabric, we need to divide the price of 1 kodi by the number of helai in 1 kodi, which is 12. Therefore, the price of 10 helai of fabric is Rp. 300,000 / 12 = Rp. 25,000. However, none of the given options match this calculation. Therefore, the correct answer is not available.

Explanation

The price of 1 kodi of fabric is Rp. 300,000. To find the price of 10 helai of fabric, we need to divide the price of 1 kodi by the number of helai in 1 kodi, which is 12. Therefore, the price of 10 helai of fabric is Rp. 300,000 / 12 = Rp. 25,000. However, none of the given options match this calculation. Therefore, the correct answer is not available.

4. Suatu jenis bakteri setiap menit berkembang biak sebanyak dua kali lipat. Jika pada menit kedua ada 4 bakteri, banyak bakteri pada menit ketujuh adalah ...

128

64

48

32

The bacteria double in number every minute, so if there are 4 bacteria in the second minute, there would be 8 in the third minute, 16 in the fourth minute, and so on. By the seventh minute, the bacteria would have doubled 6 times, resulting in 4 x 2^6 = 128 bacteria.

Explanation

The bacteria double in number every minute, so if there are 4 bacteria in the second minute, there would be 8 in the third minute, 16 in the fourth minute, and so on. By the seventh minute, the bacteria would have doubled 6 times, resulting in 4 x 2^6 = 128 bacteria.

5. Hasil dari -25 x (8 + (-9)) : (2 - 7) = ...

-5

-3

2

5

The given expression can be simplified using the order of operations (PEMDAS/BODMAS). First, we calculate the value inside the parentheses: -25 x (8 + (-9)) = -25 x (-1) = 25. Then, we calculate the value inside the second set of parentheses: (2 - 7) = -5. Finally, we divide 25 by -5, which gives us -5. Therefore, the correct answer is -5.

Explanation

The given expression can be simplified using the order of operations (PEMDAS/BODMAS). First, we calculate the value inside the parentheses: -25 x (8 + (-9)) = -25 x (-1) = 25. Then, we calculate the value inside the second set of parentheses: (2 - 7) = -5. Finally, we divide 25 by -5, which gives us -5. Therefore, the correct answer is -5.

6. Suhu udara dalam kulkas adalah -5°C. Pada suatu saat listrik padam, ternyata suhunya naik 2°C setiap menitnya. Setelah listrik padam 15 menit, maka suhu di kulkas menjadi ...

20°C

25°C

30°C

35°C

When the power goes out, the temperature inside the refrigerator increases by 2°C per minute. After 15 minutes without power, the temperature would increase by 2°C x 15 minutes = 30°C. Therefore, the new temperature inside the refrigerator would be the initial temperature of -5°C + 30°C = 25°C.

Explanation

When the power goes out, the temperature inside the refrigerator increases by 2°C per minute. After 15 minutes without power, the temperature would increase by 2°C x 15 minutes = 30°C. Therefore, the new temperature inside the refrigerator would be the initial temperature of -5°C + 30°C = 25°C.

7. Perbandingan uang Ani dan Ina adalah 3 : 5. Jumlah uang mereka Rp. 400.000. Selisih uang keduanya adalah ...

Rp.200.000

Rp.150.000

Rp.100.000

Rp.80.000

The comparison ratio between Ani and Ina's money is 3:5. This means that for every 3 units of money that Ani has, Ina has 5 units. The total amount of money they have is Rp. 400,000. To find the difference between their money, we need to find the difference between 5 units and 3 units. The difference is 2 units. Since 1 unit is equal to Rp. 400,000 divided by 8 (3+5), which is Rp. 50,000, the difference between their money is 2 units multiplied by Rp. 50,000, which equals Rp. 100,000.

Explanation

The comparison ratio between Ani and Ina's money is 3:5. This means that for every 3 units of money that Ani has, Ina has 5 units. The total amount of money they have is Rp. 400,000. To find the difference between their money, we need to find the difference between 5 units and 3 units. The difference is 2 units. Since 1 unit is equal to Rp. 400,000 divided by 8 (3+5), which is Rp. 50,000, the difference between their money is 2 units multiplied by Rp. 50,000, which equals Rp. 100,000.

8. Hasil dari 16^3/4 m 8^2/3 adalah ...

10

24

32

36

The correct answer is 32 because when we divide 163 by 4, we get 40.75. When we multiply 40.75 by 82, we get 3345.5. Finally, when we divide 3345.5 by 3, we get 1115.1667. Rounding this to the nearest whole number, we get 1115. Therefore, the result of the given expression is 32.

Explanation

The correct answer is 32 because when we divide 163 by 4, we get 40.75. When we multiply 40.75 by 82, we get 3345.5. Finally, when we divide 3345.5 by 3, we get 1115.1667. Rounding this to the nearest whole number, we get 1115. Therefore, the result of the given expression is 32.

9. Suatu pekerjaan dapat diselesaikan selama 28 hari oleh 12 orang pekerja. Setelah 16 hari pekerjaan terhenti selama 4 hari. Agar pekerjaan itu selesai tepat waktu, maka tambahan pekerja yang diperlukan adalah ...

6 orang

8 orang

10 orang

12 orang

The given information states that a job can be completed in 28 days by 12 workers. However, after 16 days, the work is stopped for 4 days. To ensure that the job is completed on time, additional workers are needed. Since the work has already been ongoing for 16 days, only 12 days are left to complete the job. To calculate the number of additional workers needed, we can use the formula: (number of workers * number of days) / (total days - days already worked). Plugging in the values, we get (12 * 12) / (28 - 16) = 144 / 12 = 12. Therefore, 12 additional workers are needed.

Explanation

The given information states that a job can be completed in 28 days by 12 workers. However, after 16 days, the work is stopped for 4 days. To ensure that the job is completed on time, additional workers are needed. Since the work has already been ongoing for 16 days, only 12 days are left to complete the job. To calculate the number of additional workers needed, we can use the formula: (number of workers * number of days) / (total days - days already worked). Plugging in the values, we get (12 * 12) / (28 - 16) = 144 / 12 = 12. Therefore, 12 additional workers are needed.

10. Data sekelompok siswa menunjukan bahwa 40 siswa gemar bermain basket, 28 siswa gemar bermain voli, 10 siswa gemar bermain keduanya. Jika ada 9 siswa yang tidak menyukai keduanya, jumlah siswa dalam kelompok tersebut adalah ... orang

87

58

57

67

The total number of students who enjoy playing basketball or volleyball is the sum of students who enjoy playing basketball (40) and students who enjoy playing volleyball (28). However, since there are 10 students who enjoy playing both sports, they are counted twice in the previous sum. To find the total number of students in the group, we subtract the 10 students who enjoy both sports from the sum of students who enjoy playing basketball or volleyball. This gives us 40 + 28 - 10 = 58. Therefore, the correct answer is 58.

Explanation

The total number of students who enjoy playing basketball or volleyball is the sum of students who enjoy playing basketball (40) and students who enjoy playing volleyball (28). However, since there are 10 students who enjoy playing both sports, they are counted twice in the previous sum. To find the total number of students in the group, we subtract the 10 students who enjoy both sports from the sum of students who enjoy playing basketball or volleyball. This gives us 40 + 28 - 10 = 58. Therefore, the correct answer is 58.