Question

the average of a number is 36. if each of 75% of a number is increased by 6 and each of the remaining number is decreased by 9 then the new average of the number is​

Answer 1

Answer:

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Answer 2

Given:

the average of a number is 36.

To find:

new average of the number.

Solution:

1) let the total number is 100%

2) 75% is increased by 6 so the 25% will decreased by 9.

3) That increase and decrease of the number is distributed on the whole number which is 100%.

4) So the new average will be

• 75%         25%

• +6             -9

• Change in the average will be 75×6 - 25×9/100 = 2.25

so the new average will be 36 + 2.25 = 38.25