A piggy bank containing only quarters had a mass of 850 grams when empty and 7822 grams when filled. If a quarter weighs 5.6 grams , estimate the amount of money inside the piggy bank
if it is 850 grams when empty (means the piggy bank by itself weighs 850 grams) and 7822 grams when full......then the weight of the money by itself is (7822 - 850) = 6972 grams
and if each quarter is 5.6 grams... 6972 / 5.6 = 1245 quarters are in there <===
