exam Maths Puzzle Numerical Ability

Solve. 10x - 1/4 = 9x + 3/8

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Solve.

Mark drove 150 miles to visit Sandra. Returning by a shorten route, he found that the trip was only 130 miles, but traffic slowed his speed by 6 miles. If the two trips took exactly the same time, what was his rate on the return trip? kwasi thought of a number,multiplied it by 3whole number 1 over 2 and added 16 to the result.if the final answer was 30,what number did he think of?