book Maths Puzzle Numerical Ability

how many years will it take $6000 invested at 8% interest to earn $1680?

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book Other Question

how do you solve this?

-1/4(-32x=40y)

& this

3(x+4y)+(-4)(8x-y) how many liters of water must be added to 8 liters of a 40 percent acid solution to obtain a 10 percent acid solution?