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| 1. |
The sum of two number is 25 and their difference is 13. Find their product. |
| Answer» 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 xy = 114. | |