问题
选择题
现在儿子的年龄是8岁，父亲的年龄是儿子年龄的4倍．父亲的年龄是儿子年龄的3倍的时候是在（ ）
A．6年后
B．5年后
C．4年后
D．3年后
答案
设x年后父亲的年龄是儿子年龄的3倍，
依题意得：3（8+x）=4×8+x，
解得：x=4．
即4年后父亲的年龄是儿子年龄的3倍．
故选C．
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现在儿子的年龄是8岁，父亲的年龄是儿子年龄的4倍．父亲的年龄是儿子年龄的3倍的时候是在（ ）
A．6年后
B．5年后
C．4年后
D．3年后
设x年后父亲的年龄是儿子年龄的3倍，
依题意得：3（8+x）=4×8+x，
解得：x=4．
即4年后父亲的年龄是儿子年龄的3倍．
故选C．
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