Question

The average weight of 8 persons increases by 2.5kg when a new persons comes in place of one them weighing 65kg .What might be the weight of the new person

Answer 1

The weight of the new member is 85kg.

EXPLANATION-

we know that,

• the average weight of the group is increased by 2.5kg=y
• the old member replaced weighs 65kg=x
• no of members in the group 8= n

now, the formula to calculate the difference between the new member and replaced member is-

n×y

=> 8×2.5

=>20

now the difference between the two is 20 kgs and the weight of old member is 65kg

hence weight of new members

65+20

85kg