book Maths Puzzle Numerical Ability

A chemist wants to mix 33% and 43% alcohol solutions to make 30 liters of 37% alcohol solution. How many liters of 33% alcohol solution is necessary?

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find the greates common factor of p and q. then divide the common factor so that the leading coefficient is p(x)=x4+2x^3+6x^2+8x+8 q(x)=x^4+2x^3+8x^2+8x+16 the greates common facto Okay, I lied, I have one more:
Could someone please help me?
I really need help to reduce this problem into lowest terms by performing the indicated operation:
5/3a-9 -3/2a + 4/