exam Maths Puzzle Numerical Ability

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...

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exam Other Question
1. f(13)
2. f(f(2)+f(3))
3. (f(1+4))/(f(1)+4)-(1/4)(4/f(1)) Find an equation for the line with y-intercept 3 that is perpendicular to the line: y=2/3x-4