4 years ago,mary's age was 0.25 of her mother's.mary is now 15 years old.how old.how old is is her mother now
人气：484 ℃ 时间：2020-02-06 05:01:23
解答
意思是：4年前,玛丽的年龄为0.25岁的她母亲的.玛丽现在15岁.多大年纪.是她母亲多大了吗?设now mary's mother'sage is x
(x-4)/4=15-4
x=(15-4)*4+4=48
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