exam Maths Puzzle Numerical Ability

the smaller of 2 no. is two-third of the greater if the sum is 120. find the no.

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exam Other Question

simplify
9 square root of 6-9 square root of 2 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