# Latihan US Matematika Kelas Ix

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| By Fifi Prialita
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Fifi Prialita
Community Contributor
Quizzes Created: 1 | Total Attempts: 417
Questions: 10 | Attempts: 439

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• 1.

### 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 ...

• A.

20°C

• B.

25°C

• C.

30°C

• D.

35°C

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

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• 2.

### 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 ...

• A.

6 orang

• B.

8 orang

• C.

10 orang

• D.

12 orang

A. 6 orang
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.

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• 3.

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

• A.

-5

• B.

-3

• C.

2

• D.

5

A. -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.

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• 4.

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

• A.

Rp.135.000

• B.

Rp.140.000

• C.

Rp.145.000

• D.

Rp.150.000

D. Rp.150.000
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.

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• 5.

### Hasil dari 163/4 × 82/3 adalah ...

• A.

10

• B.

24

• C.

32

• D.

36

C. 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.

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• 6.

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

• A.

14

• B.

-14

• C.

19

• D.

-19

B. -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.

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• 7.

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

• A.

128

• B.

64

• C.

48

• D.

32

A. 128
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.

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• 8.

### 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

• A.

87

• B.

58

• C.

57

• D.

67

D. 67
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.

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• 9.

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

• A.

10

• B.

12

• C.

15

• D.

20

B. 12
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.

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• 10.

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

• A.

Rp.200.000

• B.

Rp.150.000

• C.

Rp.100.000

• D.

Rp.80.000

C. 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.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Mar 17, 2020
Quiz Created by
Fifi Prialita