exam Maths Puzzle Numerical Ability

This involves a circular pool. When it rains, the water falls off the top rim of the pool, splashes onto the ground and causes a muddy ring to form on the bottom of the pool wall,

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exam Other Question
Translate the following statement into an algebraic equation. Let x represent the number. 7 less than 10 times a number is 9 times that same number.

 divide: 12x^3y^2-6xy^2+9y^3
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X+3