The 8 people at a party are 4 couples. Each man shakes hands with everyone except his own wife. No women shake hands with each other. What is the total number of handshakes among these 14 peoples?

In a promotional sale, anyone who buys a bottle of juice at the regular price of 7 dollars can get a second bottle of juice by paying 1 more dollar. A group has 9 people, each of them wants a bottle of juice. How many dollars does the group have to pay at least? 

Anna wrote 2 - digit number. Ben created a 4 - digit number by coping Anna’s number twice. Then Anna divided Ben’s number. What was the result she got?

Ten numbers were written on 10 cards as follows:
 

Mr. Zack chose 4 of these cards to form 4 - digit odd number. He stood front of a mirror and looked at it up - side - down through the mirror. He saw a new number. If the new number was 720 larger than the orginal one, then the orginal number is … 

How many 4 - digit numbers contain the digit 2, or the digit 3 or both?

The average height of 2 boys is 131.6cm. The average height of 4 girls is 128.3cm. What is the average height of all children?

Help me! 

John shared his cards with two friends. He gave 40% of his cards to Peter. Then he gave 1/3 of the remainder to Mary. He kept the rest of 48 cards. How many cards did John have first?

Help me!!! 

A school has 1500 pupils. On a certain day, 30 of the pupils were absent. Find the percentage of the pupils who were present on that day?

Help me!!!