book Maths Puzzle Numerical Ability

Find the dimensions of a rectangular box of 720 cubic inches of volume such that the wigth is three times as big as height and the length is 11in. more than the height.

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How do you solve the equation 9z+z-3=17 The problem I'm having trouble with is

If x = �1 and y = 2, what is the value of the expression 2x3(thats cubed) � 3xy ?

I understand how to substiture the numbers in, but