Three brothers

The three brothers have a total of 42 years. Jan is five years younger than Peter and Peter is 2 years younger than Michael. How many years has each of them?

Correct result:

J =  10
M =  17
P =  15

Solution:


J+P+M = 42
J = P-5
P = M-2

J+M+P = 42
J-P = -5
M-P = 2

J = 10
M = 17
P = 15

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