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Addition and Subtraction of Algebraic Expression

A boy attempt...

Question

A boy attempts $x + y$ sums, of which only $y - 2 z$ sums are correct. Find the number of wrong sums.

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Solution

Wrong sums $=$ Total sums $-$ Correct sums
$= (x + y) - (y - 2 z) = x + y - y + 2 z = x + 2 z$

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