m + n = 196
n + p = 422
m + p = 378
2m + 2n + 2 p = 196 + 422 + 378 = 996
2 ( m + n + p ) = 996
m + n + p = 996 :2
m + n + p = 498
196 + p = 498
p = 498 - 196
p = 302
n + p = 422
n + 302 = 422
n = 422 - 302
n = 120
m + p = 378
m + 302 = 378
m = 378 - 302
m = 76
m < n < p
