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the sum of two decimal numbers is 3.9. their difference is 0.9, and their poduct is 3.6 what are these two numbers?

  • math -

    The problem is over-defined, namely there are three conditions, but only two unknowns. It is possible that we don't have a solution if the conditions do not agree. We'll see.

    Use the first two conditions to solve for x, y such that x+y=3.9, x-y=0.9, which gives x=2.4, y=1.5.

    Now, multiply 2.4 by 1.5. If the product is 3.6, the solution is fine, if not, the problem is inconsistent.

    Can you decide to which case the problem belongs?

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