book Maths Puzzle Numerical Ability

How do you solve this with elimating the fractions first? 1/3p - 5 = 1/4p

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A dormitory now houses 30 men and allows 42 square feet of space per man. If five more men are put into this dormitory, how much less space will each man have? Okay, I'm doing my geometry homework and I need help. I have a trapezoid. The top and bottom sides are parallel. One of the angles on the top, right of the trapezoid is 128 degrees