book Maths Puzzle Numerical Ability

F(x)=x/(x+1)then
f(x-1)=

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book Other Question

The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers. Bob has 3000 feet of fencing available to enclose a rectangular field.

a) express the area A of rectangle as a function of x where x is the length of rectangle.

b) For what value of x is the area largest?

c) What is the maximum area?