Question 512051
These type of problems are fraction problems.
One drain can do the whole job in 8 days, so it does 1/8 per day.
Another drain can do the job in 4 days, so it does 1/4 per day.
x = number of days
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(1/4 + 1/8) * x = 1 whole job
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12/32 * x = 1
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x = 32/12 = 8/3
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Working together they can drain the pool in 8/3 = 2 2/3 days.
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Check this answer.
(1/4 + 1/8) * 8/3 = 1 ??
(12/32)*8/3 = 96/96 = 1
correct!
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Done.