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Linda had some 10-cent, 20-cent, 50-cent and $1 coins in her purse.
The number of 10-cent coins is equal to the number of 20-cent coins.
There were 18 more 50-cent coins than 10-cents coins.
The number of $1 coins was twice the combined total of all the other coins in Linda'a purse.
If there were a total of 657 coins in Linda's purse, what was the total value of all the 50-cent coins?
Notes to student: