分数计算器

If p ≠ 0 and , then r =

Ethan traveled from Riverside to Greenfield. He drove for 2 hours at 40 mph and then for 4 hours at 70 mph. What was his average speed for the entire trip?

If the two-digit integers A and B are positive and have the same digits, but in reverse order, which of the following could be the sum of A and B ?

Using each letter of the word ZEBRA only once how many one, two, three, four and five-letter words can be created ?

Eddie purchased baked goods for his brunch. The store sold chocolate eclairs at $1.99 each and glazed donuts in boxes of one dozen for $13.99. If Eddie spent $27.92, how many chocolate eclairs did Eddie purchase?