exam Maths Puzzle Numerical Ability

1. f(13)
2. f(f(2)+f(3))
3. (f(1+4))/(f(1)+4)-(1/4)(4/f(1))

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exam Other Question

Please,please,please I need your help! An application of a rational function is T = (AB)/(A+B), which gives the time, T, it takes for two worders to complete a particular task wher I am a beginner.

I am stuck on correct answer for:

What percent of 12 is 18?

I am not using a specific book. I am just practicing...