exam Maths Puzzle Numerical Ability

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

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exam Other Question

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? Use the Remainder Theorem to find P(c). P(x) = x4 + 3x2 + 1, c = 3

I came up with 107 I am not sure this is right?