If the sum and difference of two numbers are 20 and 8 respectively then the difference of their squares is :

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160

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180

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Solution

The correct option is B 160
Let number be $x$ and $y$
$\Rightarrow x + y = 20$
$x - y = 8$
$\Rightarrow x^{2} - y^{2} = (x + y) (x - y)$
$= 20 \times 8$
$= 160.$
Hence, the answer is $160.$

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