exam Maths Puzzle Numerical Ability

a car radiator contains 10 liters of a 30 percent anti freeze solution how many liters would have to be replaced with pure antifreeze if the resulting is to contain 50 percent?

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exam Other Question

A cone shaped pile of sand contains 5.4m^3. If the pile of sand covers 8.1m^2, how high is the pile of sand. ( uyse formula v=(1/3)(area of base) (height) to find the volume of a cube.

Thank you. X=2y-7
3X +2y=-5
use addition method