exam Maths Puzzle Numerical Ability

35 divide 3/4 =

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Write the algebraic expression and simplfy. Let x represent the unkown number.
The sum of 5 times a number and -2, added to nine times a number.
I tried 5(x-2)+9x=5x-10+9x=14x-10. There answer was 14x-2. How did they get that? The area of a trazezoid is 80 square units. If its height is 8 units, find the length of the median.