Suppose x is the original weight of the team which consists of y members.

And z be the weight of the new three members.

Statement 1: The average weight of the team increases by 20 kg

The equation will be, ( x * y + 3 * z) / ( y+3) = w + 20

1 Equation and 3 unknowns to solve : INSUFFICENT

Statement 2: The three new men substitute the earlier members whose weights were 64 kg, 75 kg and 66 kg.

We only have the information of the total weight ( 205 Kg) replaced but not what was added. so we cannot solve it. INSUFFICENT

Let us combine both : ( x * y - 205 + 3 * z) / ( y+3) = w + 20

Still 1 equation and 3 unknowns. Hence the Answer E.

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