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27 August, 13:31

The number of sit-ups Micah does is the sum of twice a number and 25. The number of sit-ups Micah does is also 3 times the number minus 25. How many sit-ups does Micah do?

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  1. 27 August, 14:16
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    125 Sit-ups.

    Step-by-step explanation:

    Let y equal the number of sit-ups and x equal the unknown number.

    y=2x+25 Sum of twice a number and 25.

    y=3x-25 3 times the number minus 25.

    Use Substitution:

    2x+25=3x-25

    x=50

    This is the unknown number.

    To solve for y, just plug the x value in.

    y=2 (50) + 25

    y=125

    So, Micah did 125 sit-ups.
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