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Kylie, Tiara and Shirley pooled a certain amount of money for a noble cause.
Kylie contributed `7/20` of the total amount.
The rest of the money was given by Tiara and Shirley in the ratio of 17 : 9.
The total amount contributed by Kylie and Shirley was $630 more than that contributed by Tiara.
Calculate the average amount of money contributed by each of the three girls.