Solving Exercise 2 Page 21 Mathematics 5

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Ngày cập nhật gần nhất: 15/4/2026

Solving problem 2 on page 21 Mathematics 5 in the review and additional exercises on problem-solving (continued), how many days is the rice reserve sufficient for?

Guidance for solving Exercise 2 Page 21 Mathematics 5

Problem:

A reserve kitchen has ample rice to feed 120 people for 20 days; in reality, 150 people are eating. How many days will the rice reserve last? (Everyone consumes the same amount of food)

Solution Method:

- Step 1: Calculate the number of days one person consumes all that rice by multiplying the number of people by the number of days the rice lasts

- Step 2: Calculate the number of days for 150 people to consume all the rice reserve by dividing the result obtained (in step 1) by the number of people.

Answer:

It takes one person to consume all that rice in:

20 x 120 = 2400 (days)

150 people will consume all that rice in:

2400 : 150 = 16 (days)

The answer is: 16 days.

Mytour has just provided a solution guide for Exercise 2 on page 21 of Mathematics 5. Additionally, we suggest solving Exercise 1 on page 21 of Mathematics 5 and Solving Exercise 3 on page 21 of Mathematics 5 using the same method. Let's explore the guide to solving exercises on page 21 of Mathematics 5 to excel in the 5th-grade math subject.

Frequently Asked Questions

How long can the rice reserve last for 150 people according to the problem statement?

According to the problem, the rice reserve can last for 150 people for 16 days. This calculation is based on the total amount of rice available, which is sufficient for 120 people over 20 days.

What is the method to solve the rice reserve problem in Mathematics 5?

To solve the rice reserve problem, first calculate the total days the rice lasts for one person by multiplying the number of people by the days. Then, divide this total by the number of people currently consuming the rice to find how many days it will last.

Is there guidance for solving other exercises in Mathematics 5?

Yes, in addition to Exercise 2 on page 21, there are suggestions to solve Exercise 1 and Exercise 3 on the same page using similar problem-solving methods. This provides a well-rounded approach to practicing the material.

What is the total amount of rice days available for 120 people?

The total amount of rice is sufficient for 120 people for 20 days. This means the reserve can feed 120 individuals continuously for the entire duration without running out of rice.

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