exam Maths Puzzle Numerical Ability

Write four pairs of equations taht show muliplication and division are inverse operations.

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exam Other Question

5/ 1/2 Please help, it asks: (x) varies directly as the square of (s) and inversely as (t). How does (x) change when (s) is doubled? when both (s) and (t) are doubled?
I am so confused. please help!!!