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m+p+pr=40            m+p=15       pr+m=14      p+pr=11

Răspuns :

15+pr=40
pr=40-15
pr=25
14+p=40
p=40-14
p=26
11+m=40
m=40-11
m=29
m + p = 15
pr = 40 - 15 = 25

pr + m = 14
25 + m = 14
m = 25 - 14 = 11

m + p = 15
p = 15 - 11 = 4

25 + 11 + 4 = 40