book Maths Puzzle Numerical Ability

i'm trying to find the inverse of a 2*1 and i wanted to know how do you do that?

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i would like some one to shwo me how to do this equation please.

2/3(5y-4)-3/5(2y+8)=0 The two digits in Jack's age are the same as the digits in Bill's age, but in reverse order. In five years Jack will be twice as old as Bill will be then. What is the difference in