Each pen costs 3 times as much as each eraser . if the total cost of two pens and four erasers is 6.30 , find the cost of each pen.

Mickey needs to cut pieces of ribbon that are each 1 meter long tie onto balloons. if he has 8 pieces of ribbon that are each 1 dekameter long. how many 1 meter pieces of ribbon can he cut

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.