exam Maths Puzzle Numerical Ability

I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help

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exam Other Question

the smaller of 2 no. is two-third of the greater if the sum is 120. find the no. the following is an equation describing growth of bacteria. A=Asubo 2^t/d
which term gives the number you start with?
which term is doubling time?
If you start with 100 bacteria