Threesome

Dana, Dalibor and Michael have a combined 57 years. Dana is five years older than Dalibor, but Dana is five years younger than Michael. Determine how old is Dana, Dalibor and Michael.

Correct result:

a =  19
b =  14
c =  24

Solution:

a+b+c=57
a = 5+b
a = c-5

a+b+c = 57
a-b = 5
a-c = -5

a = 19
b = 14
c = 24

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