Question
The sum of two number is 25 and their difference is 13. Find their product.
Answer: Option B
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Let the numbers be x and y.
Then, x + y = 25 and x - y = 13.
4xy = (x + y)2 - (x- y)2
= (25)2 - (13)2
= (625 - 169)
= 456
Therefore xy = 114.
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