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Mathematics 7 Online
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

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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