book Maths Puzzle Numerical Ability

3[2+v]-4v=v+16

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book Other Question

In the expression (-2)^5, the 5 is called the ______________, and the -2 is called the _____________________. Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 6% and the rest at 9%. He made a total of $690 in interest. How much was invested at 9%?