book Maths Puzzle Numerical Ability

An investment is made at 8% compounded annually. It grows to $702 at the end of 1 year. How much was originally invested?

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book Other Question

For all real numbers a and b, where b does not equal 0, a*b= a squared over b squared , find (3*4)(5*3) Hi I am stumped on this one: x-2/4x=1/6
the directions say to solve and check.
Thank you