book Maths Puzzle Numerical Ability

when you are adding and subtracting fractions do you have to find a common denomanator

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book Other Question

In a right triangle, if one acute angle has measure 6x-10 and the other has measure 2x-4, find the larger of these two angles.

A) 13 degrees
B) 22 degrees
C) 47 degrees
D) 68 degrees If the area of a square is 144.What is the measure of the sides?