There are 5 people at a party. If each person shock hand once with all the others, how many hand shakes tock place at the party?

 The area of a rectangle is 30 cm2. If its length is 5 cm then its perimeter is ... cm.

Maria has 10000 dollars in bills of 40 dollars. How many 40 dollars- bills does she have?

Given a parallelogram with the length of two sides are 9 cm and 13 cm. If the length of one height is 15 cm then the length of  the second height is ... cm.

 Given the parallelogram ABCD with the length of two sides AB, BC are 11 cm and 13 cm.

Each students in a class needs 3 sheets of graph of paper for the math project. Each packet of graph paper holds 25 sheets. There are 28 students in the class. What is the fewest number of packets of graph paper will need for all students?

Three oranges are weighted in pairs and these weights are 400, 412 and 424 gram. What is the weightof the lightest orange?

How fast is Jack going if the train he is on travels 20 miles in just 6 minutes?