exam Maths Puzzle Numerical Ability

How much 70% acid solution should be mixed with 7 liters of 20% acid solution to end up with a 30% acid solution?

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exam Other Question

use synthetic division to show that the number given to the right of the equation is a solution of the equation, then solve the polynomial equation.
x^3+2x^2-11x-12=0;-4

a){3,1,-4}
b){3.-1.-4}
c){-3,1,-4)
d){-3,-1,-4} DETERMINE THE POINT A(x,y) SO THAT THE POINTS A(x,y),B(O,3),C(1,0),D(7,2) WILL BE THE VERTICES OF A PARALLELOGRAM.