book Maths Puzzle Numerical Ability

5=-x/6+x/2

5=2/6

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book Other Question
John Page invested 11000 in an account that pays 12 percent simple interest. How much additional money must be invested in an account that pays 15 percernt simple interest so that the average return on two investments amounts to 13 percent? I've tried for at least an hour, PLEASE HELP!!

(The Square Root of 2x+3 added to 2x)²

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