3 pumps working 8 hours a day, can empty a tank in 2 days. how many hours a day must 4 pumps work to empty the tank in 1 day?
a. 9 b. 10 c. 11 d. 12
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Answer:
Let the required number of working hours per day be x
More pumps, less working hours per day (indirect proportioin)
Less day, more working hours per day (indirect proportion)
pumps 4 : 3
=8 :x
days 1 :2
so 4 x 1 x x = 3 x 2 x 8
= x= ( 3 x 2 x 8 ) / 4
x = 12
a. 9 b. 10 c. 11 d. 12
Post your answer's through comment...
Answer:
Let the required number of working hours per day be x
More pumps, less working hours per day (indirect proportioin)
Less day, more working hours per day (indirect proportion)
pumps 4 : 3
=8 :x
days 1 :2
so 4 x 1 x x = 3 x 2 x 8
= x= ( 3 x 2 x 8 ) / 4
x = 12
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