Question

Identify the variables which are in direct proportion.

1. The number of notebooks and their cost.

2. Number of people and consumption of food.

3. The quantity of food and its cost.

4. The number of people working and time to complete a given work.

5. Interest and the rate of interest.

6. Interest on money and the amount invested.

7. Income tax and the income.

8. The height of a tree and the number of years.
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Answer 1

Answer:

option number 1,2,3,7,8 are surely in direct proportion.....

4 is in inverse proportion..

Not sure about 5 and 6.

hope it helped.