Question

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

Answer 1

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 <===