Money Problems
 9a.*
 A bank contains $2.10 in dimes and quarters. There are 7
more dimes than quarters. How many of each coin are there?
 9b*
 A bank contains 8 coins, an assortment of dimes, nickels, and quarters, which have a value of $ 1.00.
There are twice as many dimes as quarters and all the rest of the coins are nickels. How many
dimes, quarters, and nickels are in the bank?
 9c.
 A bank containing 15 coins in dimes, nickels, and quarters, has $1.70 in total.
There are twice as many nickels as quarters. There is one more quarter than dime. How many nickels are there?
