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  • The sum of two numbers is 25 and their difference is 13. ...
Multiple choice

The sum of two numbers is 25 and their difference is 13. Find their product.

  1. 104

  2. 114

  3. 315

  4. 325

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the numbers be x and y. Then, x + y = 25 and x - y = 13. 4xy = (x + y)2 - (x- y)2 4xy = (25)2 - (13)2 4xy = (625 - 169) = 456 xy = 114

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