Question

The average weight of 5 men is decreased by 3 kg when one of them weighing 150 kg is replaced by another person. this new person is again replaced by another person whose weight is 30 kg lower than the person he replaced. what is the overall change in the average due to this dual change?

Answer 1

(Sum of weight of 5 men)/5=average weight of 5 men (x)

Sum of wt. of 5 men =5x

Let the wt. of new men =y

Acc to q

{(Sum of wt. of 5 men -150+y)/5}=x-3

5x-150+y=5x-15

y=135

z=105 (Weight of another person which come in place of new person i.e 135-30=105)

(Sum of wt. of 5 person -135+105)/5=M

5x-30=5M

x-M=30/5

x-M=6

Answer 2

Answer:

the answer is 9kg

Step-by-step explanation: