Răspuns :
a + b + c + d = 404
b = a + 2; c = a + 4; d = a + 6
a + a + 2 + a + 4 + a + 6 = 404
4a + 12 = 404|:4
a + 3 = 101|-3
a = 98
b = 100
c = 102
d = 104
b = a + 2; c = a + 4; d = a + 6
a + a + 2 + a + 4 + a + 6 = 404
4a + 12 = 404|:4
a + 3 = 101|-3
a = 98
b = 100
c = 102
d = 104