Diet for Rats A group of biologists studied the nutritional effects on rats that were fed a diet containing 10% protein.1 The protein was made up of yeast and corn flour. By changing the percentage P (expressed as a decimal) of yeast in the protein mix, the group estimated that the average weight gain g (in grams) of a rat over a period of time was given by
g = −200P2 + 200P + 20
What percentage of yeast gave an average weight gain of 60 grams?
1Adapted from R. Bressani, “The Use of Yeast in Human Foods,” in R. I. Mateles and S. R. Tannenbaum (eds.), Single-Cell Protein (Cambridge, MA: MIT Press, 1968).
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