book Maths Puzzle Numerical Ability

How would you solve the following:

x(y+12) divided by 10 (x-y) x=5 y=3



r-4 divided by 7-r

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book Other Question

A multipling procedure for 28x32. A commonly asked question is, "How long will it take to double my money?" At 10% interest rate and continous compounding, what is the answer?
The base amount should be $10,000 and the compounding rate is 2.7183.