3 persons, watch kharidne ke waste shop per phaunche. Lakin shop per kewal naoukar tha shopkeeper nahi. Naoukar ne unko khafi watches dikhay
aur unko ek watch pasand aai, jiska price 45 rupees tha . Unhone 15-15 rupees contribute kar watch kharid li . After some time shopkeeper vapas aaya . shopkeeper ne noukar ko watch ka price 40 rupees bataya aur usko 5 rupees vapas karne ke vaste diye . Noukar ne 2 rupees apny pocket me rakh liye aur 1-1 rupees un tino ko vapas kar diye . ab tino ka contribute 14-14 rupees ho gaya = 14+14+14=42 and 2 rupees in the pocket of servant = 44 so where is the one rupees