一道英文数学提!janet is three times as old as her daughter,mary.fiv

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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 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

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.

一道英文数学提!janet is three times as old as her daughter,mary.fiv Mary,who is sixteen yeas old,is four times as old as her bro 进、?1 Jane is four years old.Her brother is three times as ol three times as old as his Mary is as old as Jack is 15 years old,three times as old as his sister.How ol 10财富1Lily's father is four times as old as her brother.Her b lily's father is four times as old as her sister. Helen is twenty years old ,and her age is four times as much Mary Donaldson is worried about her 16-year-old daughter The parcel is three times as light as that one. This bridge is three times as long as that one.