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14 September, 17:39

Two mechanics worked on a car. The first mechanic worked for 15

hours, and the second mechanic worked for 5

hours. Together they charged a total of $1550. What was the rate charged per hour by each mechanic if the sum of the two rates was $130 per hour?

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Answers (1)
  1. 14 September, 20:53
    0
    Answer: For the sum of 130

    First: $90

    Second: $40

    Step-by-step explanation:

    We write equations for each part of this situation.

    The Total Charge

    Together they charged 1550. This means 1550 is made up of the first mechanics rate for 15 hours and the second's rate for 5 hours. Lets call the first's rate a, so he charges 15a. The second's let's call b. He charges 5b. We add them together 15a+5b=1550.

    The Sum of the Rates

    Since the first's rate is a and the second is b, we can write a+b=130 since their sum is 130.

    We solve for a and b by substituting one equation into another. Solve for the variable. Then substitute the value into the equation to find the other variable.

    For a+b=130, rearrange to b=130-a and substitute into 15a+5b=1550.

    15a + 5 (130-a) = 1550

    15a+650-5a=1550

    10a+650-650=1550-650

    10a=900

    a=$90 was charged by the first mechanic.

    We substitute to find the second mechanic's rate.

    90+b=130

    90-90+b=130-90

    b = $40 was charged by the second mechanic
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