Ncert solutions

Ncert solutions

Grade 8

Direct and Inverse Proportions | Exercise 13.2

Question 1

Q1) Which of the following are in inverse proportion?

        (i) The number of workers on a job and the time to complete the job.

        (ii) The time is taken for a journey and the distance traveled in a uniform speed.

        (iii) Area of cultivated land and the crop harvested.

        (iv) The time is taken for a fixed journey and the speed of the vehicle.

        (v) The population of a country and the area of land per person.

Solution:

(i) The number of workers and the time to complete the job is inverse proportion because less workers will take more time to complete work and more workers will take less time to complete the same work.

(ii) Time and distance covered in direct proportion.

(iii) Clearly, more is the area cultivated land, more is the crop harvested. So, it is a case of direct proportion.

(iv) Time and speed are inverse proportion because if time is less, speed is more.

(v) It is an inverse proportion. If the population of a country increases, the area of land per person decreases.

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subject-cta

Question 1

Q1) Which of the following are in inverse proportion?

        (i) The number of workers on a job and the time to complete the job.

        (ii) The time is taken for a journey and the distance traveled in a uniform speed.

        (iii) Area of cultivated land and the crop harvested.

        (iv) The time is taken for a fixed journey and the speed of the vehicle.

        (v) The population of a country and the area of land per person.

Solution:

(i) The number of workers and the time to complete the job is inverse proportion because less workers will take more time to complete work and more workers will take less time to complete the same work.

(ii) Time and distance covered in direct proportion.

(iii) Clearly, more is the area cultivated land, more is the crop harvested. So, it is a case of direct proportion.

(iv) Time and speed are inverse proportion because if time is less, speed is more.

(v) It is an inverse proportion. If the population of a country increases, the area of land per person decreases.

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subject-cta
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