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  3. The sum of the ages of Doris and Fred is y years．If Doris is 12 years older than Fred，how many years old will Fred be y years fr

The sum of the ages of Doris and Fred is y years．If Doris is 12 years older than Fred，how many years old will Fred be y years fr

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问题 The sum of the ages of Doris and Fred is y years．If Doris is 12 years older than Fred，how many years old will Fred be y years from now，in terms of y?
选项 A、y-6
B、2y-6
C、(y/2)-6
D、(3y-2)-6
E、(5y/2)-6
答案D
解析 Let D and F represent Doris’s and Fred’s current ages, respectively. It is given that D + F=y and D = F+ 12. It follows that (F+ 12) + F=y and . Therefore, Fred’s age y yea’s from now will be
The correct answer is D.
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