Happy marriage

Jan and Marienka have been living in a happy marriage for several years. Jan's age is written in the same numbers as Marienka only in reverse order. Their ages differ by just a fifth of Marienka's age. Jan is older. How old is Jan and how many are Marienka?

Correct result:

j =  54
m =  45

Solution:

jm=m/5 j=a 10+b m=b 10+a  a,b<0,9> j=54
m=45



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