Turistický vláčik, ktorým si môžeme prezrieť
mestské pamiatky má 28 miest. Na začiatku
obhliadky sa naplnil na tri štvrtiny. Pri druhej
zastávke dvaja turisti opustili vláčik a traja noví
sa pridali. Na tretej zastávke opustili vláčik
siedmi. Potom už pokračovala prehliadka
v nezmenenom počte turistov.
Koľko turistov prišlo na koniec prehliadky?odpoveď 15
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