exam Maths Puzzle Numerical Ability

xy + 3z + y =

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exam Other Question

2log2+3logx-1/2{log(x+3)+(x-2)}

i am having such a hard time with this question!!!!! A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91. How much is invested at 8%.