book Maths Puzzle Numerical Ability

(2+3r+r^2)/(1+3r+3r^2+r^3)

Can you help me solve this? Thanks.

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book Other Question

Please help me with this problem on page 402...Thank you very much.

1/5x+3/5y=12/5

-1/5x+3/5y=6/5 a butcher has some hamburger that is 21% fat and some 15% fat. How many pounds of each should be mixed to make 84 lbs that is 17% fat?