Three women decided to buy the new teapot which costs $30. They clubbed together by $10 to buy a teapot. Then manager said them that teapot coasts $25, he took $5 and decided return it to women. By how divide 5 on 3? That's why he returned by $1 (3 in sum) and took 2 for himself. So every woman received by$1. I mean instead of 10 one woman spent $9. How much money women spent to buy a teapot? Right, in 9x3=$27. Add $2 which manager put in his pocket, so we get $29.
The question: where is thirtieth dollar?