What does the main denominator mean?

George bought 6 pounds of apples for $8.22 what is the cost of apples per pound

What is the average amount purchased per customers in a five day period number of customers 12,15,13,18,21 and the amount purchased is $150,$175,$120,$215,$250

How many quarts of water must be added to 9 qt of an 80% antifreeze solution to make a 45% antifreeze solution?

A house in England has 8 paintings of climbers. Assuming that each painting is 8 inches wide and 4.5 inches tall, what is the length of all the sides of the paintings in inches?

A child built a toy rail road 5 meters long. He also bought two trains which run on batteries. Unfortunately he ran out of batteries and had to get batteries from other toys.

Zita wants to buy an mp3 player that is on sale for 25% off. the orignal price of the mp3 player was $200. what is the amount of the discount

To decrease an amount by 23%, multiply by?

A garden (60 ft x 40 ft) is surrounded on all sides by a 5 foot walkway. What is the area of the garden? What is the area of the walkway? What is the perimeter along the outer edge of the walkway?

Josh cut a square sheet of paper along a diagonal to make two congruent triangles. The area of one triangle is 60.5 in." Find the length of one side, s, of the square. Show your work.

In a random sample of cars driven at low altitudes, of them exceeded a standard of grams of particulate pollution per gallon of fuel consumed. In an independent random sample of cars driven at high altitudes, of them exceeded the standard.