exam Maths Puzzle Numerical Ability

how to solve?

-3(3X+1)<15

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exam Other Question

A woman deposits $50,000 in a savings account with 4% continuously compounded interest. How many years must she wait until the balance has doubled? Please help in solving this problem: Simplify 3x4y-2/9x6y4

I tried to solve the problem and I came up with 3x[4]y[-2]/9x[6]y[4]=3x2y6