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Question

Sum of two numbers is 20 and their difference is 5. Find the difference in their squares.



A

100

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B

100

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C

50

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D

25

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Solution

The correct option is A

100


Let the numbers be a and b. Assume a > b.

(a+b)(a-b) = a2b2 = 20 x 5  = 100.


Mathematics

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