a+b+c=893 turisti
b=a+35....=>a=b-35
b=c+17....=>c=b-17...=>c=a+(35-17)....=>c=a+18
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a=?b=?c=? a) |____|=>ianuarie
b) |____|__|=>februarie=a+35
c) |____|_|=>martie=b+17...=> c=a+(35-17)
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a+a+35+a+(35-17)=893 tiristi
3a+35+18=983
3a+53=983
3a=983-53
3a=840
a=840:3
a=280 turisti (in ianuarie)
b=280+35
b=315 turisti ( in februarie)
c=280+18=298 turisti ( in martie)
280+315+298=893 turisti ( in total)