exam Maths Puzzle Numerical Ability

k/3-1/3k-1/k

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exam Other Question

Let x = log(10,2) and y = log(10,3) Then find the coefficients a and b which satisfy log(10,3888)=a x +b y.

I am lost. 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