SOLUTION: 1) Mary and Greta live 21 miles apart. At 1:00 P.M. They start riding their bicycles toward each other and meet at 1:45 P.M. If Greta's average speed is 4 miles per hour faster tha

Question 1018137: 1) Mary and Greta live 21 miles apart. At 1:00 P.M. They start riding their bicycles toward each other and meet at 1:45 P.M. If Greta's average speed is 4 miles per hour faster than Mary's average speed, find Greta's average speed.
2) Margaret gets scores of 88 and 78 on her first two test. What scores must she make on her third test to keep an average of 80 or greater?
3) Sally has 3 times as many nickels as dimes and she has at least 20 coins. At least how many dimes does she have?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

2. If you want the average of three numbers to be greater than or equal to some value, then the sum of the three numbers must be greater than or equal to three times the desired average value.

John

My calculator said it, I believe it, that settles it

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