一道英文数学提!janet is three times as old as her daughter,mary.five years ago jant was four timesjanet is three times as old as her daughter,mary.five years ago jant was four times as old as mary .how old is janet now?how old will mary be in

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一道英文数学提!janet is three times as old as her daughter,mary.five years ago jant was four timesjanet is three times as old as her daughter,mary.five years ago jant was four times as old as mary .how old is janet now?how old will mary be in

一道英文数学提!janet is three times as old as her daughter,mary.five years ago jant was four timesjanet is three times as old as her daughter,mary.five years ago jant was four times as old as mary .how old is janet now?how old will mary be in
一道英文数学提!janet is three times as old as her daughter,mary.five years ago jant was four times
janet is three times as old as her daughter,mary.five years ago jant was four times as old as mary .how old is janet now?how old will mary be in 7 years'time

一道英文数学提!janet is three times as old as her daughter,mary.five years ago jant was four timesjanet is three times as old as her daughter,mary.five years ago jant was four times as old as mary .how old is janet now?how old will mary be in
Suppose Mary is x years old now.Then
4*(x-5) = 3x-5
Solve it,get x = 15
So Janet is 3x = 45 years old now and Mary will be 22 years old in 7 years' time.