exam Maths Puzzle Numerical Ability

My history teacher gave us 12 essay questions to study. He�ll choose three for a test. I have time to study only eight questions. What are the chances that at least two will appear

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1/R= 1/R1 + 1/R2 SOLVE THE EQUATION FOR R1 IN TERMS OF R AND R2.

i KNOW the first step is to isolate 1/r1

1/r-1/r2=1/r1

my guess is r1= (r-r2)/r*r2 A worker can build a fence in 16 hours. With the help of an assistant, the fence can be built in 9 hours. How long should it take the assistant, working alone, to build the fence?