16Hit 1600
Advanced MathVery hardSystem of a product and a sum

Advanced Math practice question

For numbers x and y with x > y, xy = 12 and x + y = 7. What is the value of x?

Answer: 4

Two numbers with product 12 and sum 7 are 3 and 4; the larger is x = 4.

Common wrong answers

If you answered 3
3 is y, the smaller of the pair.
If you answered 6
6 · 1 = 6 and 6 + 1 = 7, but the product must be 12.
If you answered 12
12 is the product; the pair is 3 and 4.

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