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Three girls can clean the yard in 2 hours.if their mother helps them, how long will it take them to clean the yard? What type of proportion are these and how to solve it?


Sagot :

these are INDIRECT proportion
it is when the other one rises while the other one decreases
the answer for that question is 1.5 hours

(3)x(2 hours) / (3+1)
6/4
1 1/2