172  Age
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Mary is 12 years older than Jerry. 4 years ago, Mary was 3 times as old as Jerry then. How old is Mary?



Mary is 12 years older than Jerry. 7 years ago, Mary was 4 times as old as Jerry then. How old is Mary?



Mary is 18 years older than Jerry. 4 years ago, Mary was 7 times as old as Jerry then. How old is Mary?



Mary is 6 years older than Jerry. 6 years ago, Mary was 3 times as old as Jerry then. How old is Mary?



Mary is 20 years older than Jerry. 5 years ago, Mary was 6 times as old as Jerry then. How old is Mary?

Mary is 10 years older than Jerry. 6 years ago, Mary was 3 times as old as Jerry then. How old is Mary?



Mary is 18 years older than Jerry. 5 years ago, Mary was 4 times as old as Jerry then. How old is Mary?



큰형은 작은형보다 4 살이 더많고, 8 년전에는 큰형나이가 작은형에 3 배였을때, 현재 큰형의 나이는 몇살인가?



Mary is 12 years older than Jerry. 8 years ago, Mary was 3 times as old as Jerry then. How old is Mary?



Mary is 12 years older than Jerry. 3 years ago, Mary was 7 times as old as Jerry then. How old is Mary?

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