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A charity collected 20 cent and 50 cent coins for a fund raising event in the ratio of 16:7. they collected 6912 20-cent coins. how much money did they collect altogether?

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If there were x 50-cent coins,

x/6912 = 7/16
x = 3024

So, they collected 6912*.25 + 3024*.50 = $3240.00

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