Age question

Jano is three times older than Zdeno. Zdeno is 12 years younger than Janko. How old is Jano and how old is Zdeno?

Correct result:

j =  18
z =  6

Solution:


j=3z
z = j-12

j=3•z
z = j-12

j-3z = 0
j-z = 12

j = 18
z = 6

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