小明说,今年他的年龄比爷爷的4倍还小3岁.已知小明今年15岁,爷爷今年多少岁?
小明说,今年他的年龄比爷爷的4倍还小3岁.已知小明今年15岁,爷爷今年多少岁?
数学人气：128 ℃时间：2019-11-21 07:05:11
优质解答
假设爷爷岁数为y,小明岁数为x,由条件可知y=4x+3,已知x=15,所以y=63,即为爷爷今年63岁.
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