exam Maths Puzzle Numerical Ability

A company has 2 machines that produce widgets. An older machine produces 23% defective widgets, while the new machine produces only 8% defective widgets. In addition, the new mac

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exam Other Question

Add or subtract as indicated. (finding LCD)

b/b-1 + 2b/b^2-1

a-1/a+1 + a+1/a-1

4/a-5 - 1/5-a

It would be cool if someone could explain that to me!
if 18c2r=153*13c2r-5 what is the value of r?