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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