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2014-03-03T20:04:12+02:00
T+M+F=115 (1)
M-F=24
T-M=4
(1) devine: (M+4)+M+(M-24)=115; 3M-20=115; 3M=135; M=45
M=45 T=M+4=49
45-F=24; F=21

49+45+21=115