book Maths Puzzle Numerical Ability

2x^2+2xy+x+y

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book Other Question

A tank has 10 drain pipes of the same diameter and characteristics. an inflow of water enters the tank at a uniform rate. if the tank is initially full and the 10 drain pipes are o Is there anyone who can explain what this equation is and how to calculate it?
I just found it on the web and I know nothing about it. But I do think that:
t=time
j=cycle