Question
If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their squares is
Answer: Option C
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Let the numbers be `x` and y. Then `x` + y = 20 and `x` - y = 8
`:.` `x^2 - y^2 ` = `(x + y) (x - y)` = 20 x 8 = 160
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