book Maths Puzzle Numerical Ability

An aquarium is 32 inches long, 15 inches wide and 24 inches high. the volume of water in the aquarium is 10,560 cubic inches. How deep is the water?

I know the formula for volume V=lwh but how do I set up and solve this problem?

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book Other Question

If twice a certian number is increased by 3, the result is 8 less than threes time a number. Find the number Determine the reference angle 0' for the given angle 0=200