book Maths Puzzle Numerical Ability

Three times a number, decreased by 8 is the same as twice the number, increased by 15?Find the number.

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book Other Question

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%? On a road map with a scale of 1/4 inch per 10 miles, the highway from Waukee to Winterset is 1 2/5 inches long. How many miles long is this highway?