NIFT UG 2015 Question Paper with solutions

Question : 75 of 150

Marks: +1, -0

The average weight of ten members in a group was increased by 1 kg when one of the members, who weighed 65 kg was replaced by a new man. The weight of the new man is

55 kg
65 kg
75 kg
85 kg

Validate

Solution:

Let, new member wt. is x kg
Then, average

={∑(\text "wt. of 9 members")+ x}/10

Initialy, average wt. =

{∑(\text "wt. of 9 members")+65}/10

From question, difference in two average wt.is 1 year
So,

{∑(\text "wt. of 9 members")+x}/10-({∑\text "wt. of 9 members"+65}/10)=1

x-65=10

x=75

years
Hence, wt. of new member = 75 years

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