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SAT
Easy
Question
Observed Matings among Fruit Flies

The table above shows the observed mating frequencies among a group of fruit flies raised on either a starch medium or a maltose medium. "What fraction of the observed matings were between fruit flies that were raised on the same medium?
The correct answer is: 
The total group is of 59
The male or female raised on only starch = 22
The male or female raised on only maltose = 20
The total being raised on some medium = 22 + 20 = 42
The function is 
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