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OpenStudy (anonymous):
It takes 90 minutes to wash 20 vehicles at a car wash. At this rate, how many minutes does it take to wash 5 vehicles? 22 ½ minutes 22 minutes 14 minutes 7 ½ minutes
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OpenStudy (anonymous):
90/4 = ?
OpenStudy (anonymous):
this is something diffent called ratio's, you want to compare 90/20 and ?/5
OpenStudy (anonymous):
to find that you cross multiply and divide whats left so 90(5) = 450 450/22.5
OpenStudy (anonymous):
22 1/2 min is your answer
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