exam Maths Puzzle Numerical Ability

If a sum of 12000 doubles in 5 years at compound interest basis.Then what will be the amount after 20 years, if compounded annually?

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exam Other Question

5/(2x-4) - 3/(2-x) is the problem
this is what I have done
5/2(x-2) - 3/(2-x)
I know the quotient of a-b and b-a is -1 which is what x-2 and 2-x are
BUT WHAT NOW ???? how does this information help me? n q
2 11
4 17
5 23
8 29
10 35
Whats is the rule of this algebraic expression?

Which one of these senetences best describes this rule.
Q=(3+N)*5 Q=3*(N+5) Q=3N+5