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.
一道英文數(shù)學(xué)提!janet is three times as old as her daughter,mary.five years ago jant was four times
一道英文數(shù)學(xué)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
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
英語(yǔ)人氣：646 ℃時(shí)間：2019-10-08 21:05:16
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