exam Maths Puzzle Numerical Ability

this year your brother james
will be 2 years from being twice as old as your sister jenny. The sum of james age and 3 times jennys age is 66. How old is Jenny

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exam Other Question

I have a word problem. If you deposit money today into an account that pays 6.5 percent interest, how long will it take for you to double your money?

Please help me with the word problem.

thanks Hi,I was wondering if I was doing this problem correctly.
3/4 (three fourths) times the sqrt of negative 144
The answer I got was 108i, is that correct?
Thank you for your time.