Solve Exercise 3 on page 21 of Math 5 Textbook

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Ngày cập nhật gần nhất: 15/4/2026

Solve Exercise 3 on page 21 of Math 5 Textbook: This exercise is part of the review and additional practice on problem solving. To drain water from a pond, 3 pumps need to work continuously for 4 hours. To finish the task earlier, 6 pumps were used instead. How many hours will it take to drain all the water from the pond?

Guide to Solve Exercise 3 on page 21 of Math 5 Textbook

Exercise:
To drain water from a pond, 3 pumps need to work continuously for 4 hours. To finish the task earlier, 6 pumps were used instead. How many hours will it take to drain all the water from the pond?

Solution method:
Apply the ratio method to solve this problem
- Step 1: Calculate the number of times 6 pumps pumps is 3 pumps
- Step 2: To know how many hours it takes for 6 pumps to drain the lake, divide the number of hours that 3 pumps work continuously by the number of times that 6 pumps is 3 pumps.

Above is the solution guide for exercise 3 page 21 Mathematics textbook Grade 5 concentration practice. Additionally, this section also includes 2 other exercises: Solve exercise 1 page 21 Mathematics Grade 5 textbook and Solve exercise 2 page 21 Mathematics Grade 5 textbook, let's check the solution guide for page 21 Mathematics Grade 5 exercises to study Mathematics Grade 5 well.

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