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

Write the equation of the line that passes through the piont (4,-9) with the slope 1/5 in piont-slope form How much does a fish weigh if its tail weighs 4 kilograms (kg), its head weighs as much as its tail and half its body, and its body weighs as much as its head and tail together?