exam Maths Puzzle Numerical Ability

An isoscelenes trapezoid has one base 23 inches long, and a height of 8 inches. If the area of the trapezoid is 136 square inches, what is its perimeter?

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The period of a simple pendulum is directly proportional to the square root of its length. If a pendulum has a length of 6 feet and a period of 2 seconds, to what length should it be shortened to achieve a 1 second period. soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb mixture that is 13% protein?