A tank fills at 7 liters per minute. How many minutes to fill 56 liters?

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Prepare for the GMAS 6th Grade Mathematics Test with guided quizzes. Study using flashcards and multiple-choice questions with detailed hints. Succeed in your math exam!

Multiple Choice

A tank fills at 7 liters per minute. How many minutes to fill 56 liters?

Explanation:
Think about rate as how much is added each minute. If 7 liters flow in per minute, then after t minutes you have 7t liters. You want 56 liters, so set 7t = 56 and solve for t. Dividing both sides by 7 gives t = 8. So it takes 8 minutes to reach 56 liters. You can check by adding 7 liters eight times: 7, 14, 21, 28, 35, 42, 49, 56. After 7 minutes you’d have 49 liters, and after 9 minutes you’d have 63 liters, so 8 minutes is the exact amount.

Think about rate as how much is added each minute. If 7 liters flow in per minute, then after t minutes you have 7t liters. You want 56 liters, so set 7t = 56 and solve for t. Dividing both sides by 7 gives t = 8. So it takes 8 minutes to reach 56 liters. You can check by adding 7 liters eight times: 7, 14, 21, 28, 35, 42, 49, 56. After 7 minutes you’d have 49 liters, and after 9 minutes you’d have 63 liters, so 8 minutes is the exact amount.

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