book Maths Puzzle Numerical Ability

A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 35feet. if the distance across the top of the mirror is 54inches, how deep is t

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If 5 is added to the sum of two consecutive integers, the result is three less than twice the larger integer. Find the integers.

I keep getting 8 The lenght of a rectangle is (3x) yards and its width is (x+2) yards. For what value of x will the perimeter of the rectangle be 40 yards.