exam Maths Puzzle Numerical Ability

Suppose you borrow money for 6 months. If the interest rate is compounded monthly, the formula A=P(1+r/12)^6 gives the total amount A to be repaid at the end of 6 months. For a l

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exam Other Question
11 years ago, Hye was four times as old as her brother. In 1 year she will be twice as old as he is now. What are their ages now? multiply, multiple choice:

-3a^2b 14a^3b^2
------ * ---------
35a^5 -9b^4

Answers:
a)9/6

B)2b/15

C)9/15

D)2/15b

I am very confused on this pro