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13 March, 15:37

when I multiply my first number by 3 and my second lucky number by 2, the addition of the resulting produces a sum of 93. when I add twice my first lucky number to my second lucky number the sum is 53. what are my lucky numbers?

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  1. 13 March, 17:46
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    Let f = first lucky number, and let s = second lucky number.

    Translate the sentences into two equations in two unknowns, and solve the system of equations to find the two unknowns.

    "when I multiply my first number by 3 and my second lucky number by 2, the addition of the resulting produces a sum of 93."

    3f + 2s = 93

    "when I add twice my first lucky number to my second lucky number the sum is 53."

    2f + s = 53

    Now you have a system of equations.

    3f + 2s = 93

    2f + s = 53

    Let's use the substitution method. Solve the second equation for s.

    s = 53 - 2f

    Now we substitute 53 - 2f for s in the first equation.

    3f + 2s = 93

    3f + 2 (53 - 2f) = 93

    Distribute the 2.

    3f + 106 - 4f = 93

    Combine like terms on the left side.

    -f + 106 = 93

    Subtract 106 from both sides.

    -f = - 13

    Divide both sides by - 1.

    f = 13

    Now substitute f = 13 in the second original equation.

    2f + s = 53

    2 (13) + s = 53

    26 + s = 53

    Subtract 26 from both sides.

    f = 27

    Answer: The first lucky number is 13, and the second lucky number is 27.
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