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OpenStudy (anonymous):
joan can mow a 10-acre field in 5 hours. How long would it take her to moa a 4-acre field?
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OpenStudy (anonymous):
5/10 = x/4 20 = 10x x = 2
OpenStudy (anonymous):
10/5 = 4/x
OpenStudy (anonymous):
20 = 10x
OpenStudy (anonymous):
x = 2
OpenStudy (anonymous):
or in your head. ten for 5 hours, 2 an hour. so 4 takes 2 hours
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