state gov UP Police Head Operator (Radio Cadre) Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
A tank has n pipes attached to it, out of which 2 are outlet pipes and the rest are inlet pipes. Each inlet pipe can fill a tank in 10 hours and each outlet pipe can empty the full tank in 15 hours. When all the pipes are opened together then 91\(\frac{2}{3}\)% part of the tank is filled in 2\(\frac{1}{2}\) hours. What is the value of n?
1
9
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8
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7
4
6