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

simplify each expression

9ab+8ab-7ab

how do i do this
Determine wether -5 satisfies the compound inequality.

3x > -15 and -2x < 11