Average Practice Test 2

Question : 19 of 40

Marks: +1, -0

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

90 kg
85 kg
80 kg
75 kg

Validate

Solution:

Let the originally average weight of 8 persons be x kgs. and the weight of new person be

x_1

kg then,

{8x-65+x_1}/8=x+2.5

⇒ 8x - 65 + x_1 = 8x + 20

∴ x_1 = 20 + 65

= 85 kgs

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