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A city employee paints curbs in parking lots and replaces road signs. It takes 0.5 hour to paint a parking lot curb and 2.5 hours to replace a road sign

User Prashu
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Question is incomplete. Here is the complete question.

A city employee paints curbs iin parking lots and replaces road signs. It takes 0.5 hour to paint a parking lot curb and 2.5 hours to replace a road sign. The function below can be used to find c, the number of parking lot curbs the employee paints when he replaces r road signs in a 40-hour workweek.


c=(40-2.5r)/(0.5)

If the employee painted 20 curbs in one week, how many road signs did he replace that week?

a) 20 b) 30 c) 0 d) 12

Answer: d) 12

Explanation: In one week, the employee painted 20 curbs.

c is the number of curbs painted in one week, so: c = 20


20=(40-2.5r)/(0.5)


40-2.5r=20*0.5


-2.5r=10-40


-2.5r=-30


r=(-30)/(-2.5)

r = 12

In one week, the employee replaced 12 road signs.

User Grexlort
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