book Maths Puzzle Numerical Ability

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?

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book Other Question

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? please answer this question for me- translate the quotient of a number and seven is two into an equation and solve