exam Maths Puzzle Numerical Ability

One type of gasohol is 10% alcohol and another type is 35% alcohol. How much of each type must be mixed to obtain 400 gallons of a 25% alcohol mixture?

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exam Other Question

Given f(x)=-5x^4+x^3+2x^2+3x+1, and k=1, express f(x) in the form f(x)=(x-k)q(x)+r

thank you You dive directly upward from a board that is 48 feet high. After t seconds your height above the water is described by the polynomial.

-16t^2+32t+48

a. Factor the polynomial