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?
y-6
2y-6
~$\frac{y}{2}$~-6
~$\frac{3y}{2}$~-6
~$\frac{5y}{2}$~-6
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d-f=12
f+y=?
翻译过来是“y年后， F多大”
设D和F分为为他两的年龄
D + F = y
D - F = 12
F = y/2 - 6
题目y 年之后F的年龄多大
F + y =3y/2 - 6
还原成Fred will be how many years old y years from now?
D + F = y
D - F = 12
F = y/2 - 6
题目y 年之后F的年龄多大
F + y =3y/2 - 6