How would you attempt this?
Algebra
Level
pending
two pipes M and N can fill a cistern in 24 min and 32 min , repectively. If both the pipes are opened together, then after hoe many minutes N should be closed so that the tank is full in 18 minutes ?
The answer is 8.
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Note that M was open for full 18 minutes so the work done by M is 4 3 so the left work of 4 1 was done by N. N completes the work 32 minutes so the 4 1 th of work is done in 8 minutes.