aptitude

solve for X and Y.
125x + 5y = 21
1.5x + 1/2y = 3

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  1. clearing fractions and decimals, we have

    125x + 5y = 21
    3x + y = 3

    now you can substitute y = 3-3x to get

    125x + 5(3-3x) = 21

    Now it's easy to solve for x, and then you can get y.

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