SOLUTION: A piggy bank containing only quarters has a mass of 850 grams when empty and 7822 when filled. If a quarter weighs 5.6 grams,about how many coins will be inside the piggy bank? b

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Question 1106882: A piggy bank containing only quarters has a mass of 850 grams when empty and 7822 when filled. If a quarter weighs 5.6 grams,about how many coins will be inside the piggy bank?
b)How much money will be inside the piggy bank?
Answer by Theo(13342) About Me  (Show Source):
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the piggy bank weighs 850 grams when it is empty and weighs 7822 grams when it is filled with quarters.

that means the total weight of the quarters is 7822 - 850 = 6972 grams.

since each quarter weighs 5.6 grams, then the number of quarters has to be 6972 / 5.6 = 1245.

there are 1245 quarters in the piggy bank.

since there are 4 quarters to a dollar, then 1245 quarters / 4 = 311.25 dollars, or 311 dollars and 25 cents.