7. If 9 carpenters can make a certain number of chairs in 12 days by working 5 hours
a day, for how many hours a days would 4 carpenters have to work in order to
make twice the number of chairs in 30 days?
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Step-by-step explanation:
If A : B = 4 : 7 and B : C = 5 : 9 then A : B : C is :
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