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A form sorting machine can sort 12 forms in 10 minutes. How many forms can it sort in one and half hours at this rate ?

A form sorting machine can sort 12 forms in 10 minutes. How many forms can it sort in one and half hours at this rate ? Correct Answer 108

One and half hours = 90 minutes The machine, in 10 minutes, can sort 12 forms So, it, in 90 minutes, can sort 12 x 90 / 10 = 108 forms 

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