The average weight of 4 boys is 42 Kg. The weight of the first, second and third boys are 2 Kg. less, 5 Kg. more and 1 Kg. less than the weight of the fourth boy. Find the weight of the fourth boy.
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Answer:
Given average weight =42
Therefore, weight of first boy (b1)= 42-2=40
Weight of the second boy (b2)= 42+5=47
Weight of the third boy (b3)= 42-1=41
Let weight of the fourth boy be (b4)
Now according to the question,
=>(b1+b2+b3+b4)÷4= 42
=>(40+47+41+b4)÷4=42
=>(128+b4)÷4=42
=>128+b4=42×4
=>128+b4=168
=> b4= 168–128
=> b4= 40
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