TCS Company Logical Reasoning Cryptography

there are 12 pipes that are connected to a tank.some of them are fill pipes and the others are drain pipes.each of the fill pipes can fill the tank in 8 hours and each of the drain pipes can drain the tank completely in 6hours.if all the pipes are kept open, the empty tank gets filled in 24hours. how many of the 12pipes are fill pipes?

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TCS Other Question

if A and B work together , they will complete a job in 7.5days.however, if A works alone and completes half of the work and then B takes over and complete the remaining half alone, they will take 20days.how long will B alone takes to do the work if A is more efficient than B? 3 , 2 , 6 , 4 , 0 , ? next term ????