exam Maths Puzzle Numerical Ability

Find the volume of 5" x 10" x 50" =

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exam Other Question

A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%? Simplify the expression.
3y^2 + 5yz + 2z^2
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2y^2 + 3yz + z^2