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Question

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



A

120

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B

280

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C

160

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D

180

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E

170

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Solution

The correct option is C

160


Let the numbers be x and y. Then, x+y=20 and x-y=8 x2y2=(x+y)(xy)=20×8=160.


Quantitative Aptitude

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