exam Maths Puzzle Numerical Ability

My 5th grade daughter has the following problem, that I cant figure out.
Insert Parentheses where necessary to make the number sentence true:
500/10^2+3*6=118

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exam Other Question

k/3-1/3k-1/k If a man deposits $150 at the end of each 3 month period and if interest is at 7% per year compounded quarterly, how much money will he accumulate in 25 years?