Karen makes $5 per hour baby-sitting and $12 per hour giving music lessons. One weekend, she worked a total of 18 hours and made $139. How m

Question

Karen makes $5 per hour baby-sitting and $12 per hour giving music lessons. One weekend, she worked a total of 18 hours and made $139. How many hours did she spend baby-sitting?

F)11
G)9
H)6
J)7​

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Nem 3 months 2021-08-17T02:40:43+00:00 1 Answers 2 views 0

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    2021-08-17T02:41:58+00:00

    Answer:

    F) 11

    Step-by-step explanation:

    We know that she worked 18 hours, and earned $139.

    Let’s just say that she spent x hours baby-sitting.

    If she makes $5 per hour, the total amount of money she earned from baby-sitting would be 5x.

    If she spent x hours baby-sitting, that would mean that she spent 18-x hours giving music lessons.

    So, the total amount of money she earned from music lessons would be 12(18-x).

    Now we can plug this into an equation.

    5x + 12(18-x) = 139.

    5x + 216 – 12x = 139.

    5x – 12x = -77

    -7x = -77

    x = 11.

    This means that she spent 11 hours baby-sitting.

    Hope this helps!

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