Kuis Perbandingan Kelas 7

Explanation
The correct answer is D because the proportion 11/42 represents the ratio of the number of male students (X) to the total number of students (100). This is because there are 11 male students out of a total of 42 students. So, the proportion 11/42 = X/100 can be used to determine the percentage of male students in the choir class.

Explanation
Karina spends 5 units of time on Math and 4 units of time on Science. If she spends 40 minutes on Math, we can set up a proportion: 5/4 = 40/x, where x is the time spent on Science. Cross-multiplying gives us 5x = 160, and dividing both sides by 5 gives us x = 32. Therefore, Karina spends 32 minutes on Science.

Explanation
The machine can cap 14 bottles in 84 seconds. To find out how many bottles it can cap in 2 minutes (120 seconds), we can set up a proportion. Since the number of bottles is directly proportional to the time taken, we can write the proportion as 14/84 = x/120. Cross-multiplying, we get 84x = 14 * 120, which simplifies to x = (14 * 120) / 84. Solving this equation, we find that x = 20. Therefore, the machine can cap 20 bottles in 2 minutes.

Explanation
Based on the given information, Pak Chandra's motorboat requires 24 liters of diesel to travel a distance of 80 km at a speed of 32 km/h. Therefore, we can calculate the fuel consumption rate as 24 liters / 80 km = 0.3 liters/km.

To find out how much fuel is needed to travel 120 km at the same speed, we can multiply the fuel consumption rate by the distance: 0.3 liters/km * 120 km = 36 liters.

Therefore, the correct answer is C. 36 liters.

Explanation
The given question states that Pak Hendra is paid Rp360,000 for 3 hours of training. To find out how many hours he would need to work to earn Rp7,200,000, we can set up a proportion. We can say that Rp360,000 is to 3 hours as Rp7,200,000 is to x hours. By cross-multiplying and solving for x, we find that x is equal to 60 hours. Therefore, the correct answer is c. 60 jam.

Explanation
The given information states that a task can be completed in 16 days by 7 people. Therefore, the total work required to complete the task is 16 days * 7 people = 112 person-days.

If 3 workers are assigned to another task, then the remaining workers will be 7 - 3 = 4 people.

Since the total work required remains the same, the time taken to complete the task by the remaining workers will be 112 person-days / 4 people = 28 days.

Therefore, the correct answer is A. 28 hari.

Explanation
The correct answer is Option 1 because it shows a graph that represents the relationship between weight and price of chocolate. Since the question mentions that 5 ounces of chocolate are sold for Rp10.000,00, it implies that the price is fixed and the weight is variable. Therefore, the graph in Option 1, which shows weight on the x-axis and price on the y-axis, accurately represents this relationship.

Explanation
Pada hari pertama, Pak Bambang menempuh jarak 358 km. Dengan konsumsi rata-rata mobil 20 km/liter, maka Pak Bambang membutuhkan 358 km / 20 km/liter = 17,9 liter bahan bakar. Pada hari kedua, Pak Bambang menempuh jarak 370 km. Dengan konsumsi rata-rata yang sama, maka Pak Bambang membutuhkan 370 km / 20 km/liter = 18,5 liter bahan bakar. Total bahan bakar yang dibutuhkan untuk perjalanan dari Medan ke Padang adalah 17,9 liter + 18,5 liter = 36,4 liter.

Explanation
The scale given in the question is 1 in = 3 meters. The width of the store on the drawing is 2 inches. To find the actual width of the store, we need to multiply the width on the drawing by the scale factor. Therefore, the actual width of the store that Jamila wants to make is 2 inches x 3 meters/inch = 6 meters.

Explanation
The correct answer is d. Kecepatan yang ditempuh Pak Ikhsan saat pulang sekitar 20 mil per jam lebih lambat dari keberangkatan. This is because the distance traveled by Pak Ikhsan from his workplace to his home is the same as the distance traveled from his home to his workplace. Since the average speed is given as 62 miles per hour for the journey to work, and the journey back takes 6.5 hours, we can calculate the distance traveled on the return journey as 62 miles per hour multiplied by 6.5 hours, which equals 403 miles. Therefore, the speed on the return journey is 403 miles divided by 6.5 hours, which is approximately 62 miles per hour. This means that the speed on the return journey is the same as the speed on the journey to work, so the answer is that the speed on the return journey is around 20 miles per hour slower than the speed on the journey to work.