exam Maths Puzzle Numerical Ability

I need this worked out so I can understand on how to do it. Page 87
The problem is 12% of what is 48?

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exam Other Question

72. A study by Dr. Aaron R. Folsom concluded that waist to hip ratios are a better predictor of 5 year survival than more traditional height to weight ratios. Dr. Folsom concluded the question states:
if f(x)=-3x+12, find f(1/3).