Persamaan Dan Pertidaksamaan Linear Satu Variabel (Perbandingan) (Kls.7)

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| By AndreasRusdiTure
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AndreasRusdiTure
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Quizzes Created: 6 | Total Attempts: 24,273
| Attempts: 1,025
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  • 1/10 Pertanyaan

    Perbandingan 2 lusin terhadap 96 buah adalah ... .

    • 1 : 2
    • 1 : 3
    • 1 : 4
    • 1 : 5
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Persamaan Dan Pertidaksamaan Linear Satu Variabel (Perbandingan) (Kls.7) - Quiz

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  • 2. 

    Jika perbandingan a : 7 dan 36 : 84 merupakan perbandingan seharga (senilai), maka nilai a yang benar adalah ... .

    • 3

    • 4

    • 5

    • 6

    Correct Answer
    A. 3
    Explanation
    The given question states that the ratio a : 7 is equivalent to the ratio 36 : 84. To find the value of a, we can set up a proportion using the given ratios. Cross-multiplying, we get 84a = 36 * 7. Simplifying further, we find that 84a = 252, and dividing both sides by 84, we get a = 3. Therefore, the correct value of a is 3.

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  • 3. 

    Hendrik mempunyai sebuah foto berukuran 4 cm x 6 cm. Foto tersebut akan diperbesar menjadi 5 kali. Perbandingan luas foto mula-mula dengan luas foto setelah diperbesar adalah ... .

    • 1 : 125

    • 1 : 100

    • 1 : 25

    • 1 : 20

    Correct Answer
    A. 1 : 25
    Explanation
    The original photo has dimensions of 4 cm x 6 cm, which gives it an area of 24 cm². When the photo is enlarged by a factor of 5, the new dimensions become 20 cm x 30 cm, resulting in a new area of 600 cm². The ratio of the original area to the enlarged area is therefore 24 cm² : 600 cm², which simplifies to 1 : 25.

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  • 4. 

    Uang Wahyu sebesar Rp. 630.000,00. Jika perbandingan uang Wahyu dan uang Wisnu adalah 3 : 5, maka banyaknya uang Wisnu adalah ... .

    • Rp. 378.000,00

    • Rp. 890.000,00

    • Rp. 950.000,00

    • Rp. 1.050.000,00

    Correct Answer
    A. Rp. 1.050.000,00
    Explanation
    The given question states that the ratio of Wahyu's money to Wisnu's money is 3:5. Since the amount of Wahyu's money is given as Rp. 630,000, we can calculate the amount of Wisnu's money by multiplying the ratio with the given amount.

    3/5 * Rp. 630,000 = Rp. 1,050,000

    Therefore, the correct answer is Rp. 1,050,000.

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  • 5. 

    Untuk menjamu 240 orang diperlukan 90 roti. Jika tersedia 120 roti, maka banyaknya orang yang dapat dijamu ada ... .

    • 320 orang

    • 300 orang

    • 280 orang

    • 260 orang

    Correct Answer
    A. 320 orang
    Explanation
    Dalam pertanyaan ini, diketahui bahwa 90 roti diperlukan untuk menjamu 240 orang. Oleh karena itu, dapat diasumsikan bahwa setiap roti dapat digunakan untuk menjamu 240/90 = 2,67 orang. Jika hanya tersedia 120 roti, maka dapat dihitung bahwa jumlah orang yang dapat dijamu adalah 120 x 2,67 = 320 orang.

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  • 6. 

    Suatu pekerjaan dapat diselesaikan oleh 15 orang dalam waktu 2 minggu. Jika pekerjaan itu akan diselesaikan dalam waktu 10 hari, maka banyaknya tambahan pekerjaa adalah ... .

    • 5 orang

    • 6 orang

    • 14 orang

    • 21 orang

    Correct Answer
    A. 6 orang
    Explanation
    If a job can be completed by 15 people in 2 weeks, it means that the total work required is equivalent to 15 x 2 = 30 person-weeks. To complete the same job in 10 days, which is equivalent to 10/7 = 1.43 weeks, we need to calculate the total work required as 30 person-weeks / 1.43 weeks = 20.98 person-weeks. Since we cannot have a fraction of a person, we round up to the nearest whole number, which is 21. Therefore, the additional number of workers needed is 21 - 15 = 6 people.

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  • 7. 

    16 orang siswa SMP bersama-sama dapat menyelesaikan 640 soal dalam waktu 2 jam. JIka 640 soal ingin diselesaikan dalam waktu 1 jam, maka banyaknya siswa yang dibutuhkan utnuk mengerjakan soal-soal tersebut adalah ... .

    • 8 siswa

    • 16 siswa

    • 24 siswa

    • 32 siswa

    Correct Answer
    A. 16 siswa
    Explanation
    16 siswa dibutuhkan untuk mengerjakan soal-soal tersebut dalam waktu 1 jam. Hal ini karena 16 siswa dapat menyelesaikan 640 soal dalam waktu 2 jam. Jika waktu yang tersedia hanya 1 jam, maka jumlah siswa yang dibutuhkan tetap sama yaitu 16 siswa.

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  • 8. 

    Skala sebuah peta 1 : 75.000. Jarak antara kota A dan kota B adalah 3,9 km. Jarak kota A dan kota B apada peta adalah ... .

    • 5,2 cm

    • 5,4 cm

    • 5,6 cm

    • 5,8 cm

    Correct Answer
    A. 5,2 cm
    Explanation
    The scale of the map is given as 1:75,000. This means that 1 unit on the map represents 75,000 units in reality. The distance between city A and city B is 3.9 km. To find the distance on the map, we divide the actual distance by the scale factor: 3.9 km / 75,000 = 0.000052 km. Since 1 cm on the map represents 0.000052 km, we can multiply the distance on the map by 100,000 to convert it to centimeters: 0.000052 km * 100,000 = 5.2 cm. Therefore, the distance between city A and city B on the map is 5.2 cm.

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  • 9. 

    Suatu peta dibuat dengan ukuran setiap 8 cm mewakili jarak sesungguhnya 96 km. Jika jarak dua kota 168 km, maka jarak pada peta adalah ... .

    • 12 cm

    • 14 cm

    • 16 cm

    • 18 cm

    Correct Answer
    A. 14 cm
    Explanation
    The scale of the map is 8 cm representing 96 km. To find the distance on the map, we can set up a proportion: 8 cm/96 km = x cm/168 km. Cross-multiplying, we get 96x = 8 * 168. Solving for x, we find x = 14 cm. Therefore, the distance on the map is 14 cm.

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  • 10. 

    Sebuah peta dibuat dengan skala  1 : 1.800.000. Jika jarak dua kota pada peta adalah 10,25 cm, maka jarak sebenarnya adalah ... .

    • 174, 5 km

    • 179,5 km

    • 184,5 km

    • 189,5 km

    Correct Answer
    A. 184,5 km
    Explanation
    The scale of the map is 1:1,800,000, which means that 1 cm on the map represents 1,800,000 cm in real life. The distance between the two cities on the map is 10.25 cm. To find the actual distance, we multiply 10.25 cm by 1,800,000 cm, which equals 18,525,000 cm. Converting this to kilometers, we divide by 100,000 (since there are 100,000 cm in a kilometer), resulting in 184.5 km. Therefore, the correct answer is 184.5 km.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
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  • Aug 15, 2012
    Quiz Created by
    AndreasRusdiTure

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