Question

if two quantities are related in a such way that an increase in one quantity leads to the corresponding decrease in the other and vice-versa then the quantities are said to vary
1) directly
2) constant
3) inversely
​

Answer 1

Answer:

A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same?

ANSWER:

Let the duration of each period, when there are 9 periods a day in the school, be x minutes. The following table is obtained.

Duration of each period (in minutes)

45

x

Number of periods

8

9

If there is more number of periods a day in the school, then the duration of each period will be lesser. Hence, this is a case of inverse proportion. Therefore

45 × 8 = x× 9

Hence, in this case, the duration of each period will be 40 minutes.

Step-by-step explanation:

sorry I not examples