math
posted by lily .
a group of friends took a bus trip. Each traveler gave the bus driver a tip using the same nine coins. the total tip was $8.41. how many dimes did the driver receive?

How many travelers were there? Divide that number into the total tip to see what each traveler gave. Then see how many dimes are needed to get that amount using 9 coins. Multiply the number of dimes by the number of travelers.
I hope this helps. Thanks for asking.