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March 4, 2015

March 4, 2015

Posted by **casandra** on Monday, June 20, 2005 at 1:11am.

We are trying to find the hourly cost of the sprayer and the hourly cost of the generator. These are unknown.

From the cost of the first job, we know that:

6 hours of sprayer use + 6 hours of generator use = $90

To find out what it would cost for 1 hour of sprayer use and 1 hour of generator use, divide both sides of the equation by 6. We get:

1 hour of sprayer use + 1 hour of generator use = $15

Now rearrange this equation to find out how much 1 hour of sprayer use costs:

1 hour of sprayer use = $15 - 1 hour of generator use

From the cost of the second job, we know that:

4 hours of sprayer use + 8 hours of generator use = $100

Subsitute in our equation for the cost of 1 hour of sprayer use:

4 x ($15 - 1 hour of generator use) + 8 hours of generator use = $100

Multiply this out:

$60 - 4 hours of generator use + 8 hours of generator use = $100

Solve the equation:

4 hours of generator use = $40

1 hour of generator use = $10

Therefore:

1 hour of sprayer use = $5

Hope this helps,

A Tutor

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