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10 September, 22:07

The cost C (in dollars) of making n watches is represented by C=15n 85. How many watches are made when the cost is $385?

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  1. 11 September, 00:17
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    We know that C is 385, so we can plug that in to get the equation 385=15n+85. To find the number of watches, we have to solve for n.

    To do that we have to ...

    385=15n+85

    First subtract both sides of the equal sign by 85 (because we need to do the opposite)

    300=15n (because 85-85 is zero, so we eliminated that, and 385-85 is 300)

    Now we divide both sides of the equal sign by 15 (again, opposites)

    20=n (because 15n/15 leaves us with n since both 15s cancel out, and 300/15 is 20)

    So the number of watches made were 20.
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