In the beginning kids will solve the last two problems from the last lesson that they did not have time.
1. $2 bill
A store owner has only $2 dollar bills. The customer who comes in has only $2 and $5 dollar bills. The items in the store cost $1, $2, $3, $4, $5, $6, $8, and $10. Prove that the customer can buy any of the items in the store and get back correct change.
2. How many children study two foreign languages
There are 25 children in the class. 17 study French, 15 study Spanish. Any student study at least 1 foreign language. How many kids study 2 foreign languages?
3. How many three digits numbers
How many are three digits numbers where all digits are 1 or 2 or 3?
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