The US quarter has a mass of 5.67 grams and is approx. ?

Question

1.55 mm thick. how many quarters would have to be stack?ed in order to reach the height of 575 feet? How much would this stack weigh?

Answer 1

convert mm to inches using 25.4 mm to the inch (hence 25.4*1.55=39.57 quarters per inch), then multiply times 12 to get quarters per foot, then by 575 to get the number of quarters in the stack.  Multiply that result by the weight of one quarter and you will have the weight in grams.

Answer 2

Height = 575 feet x 12 in/ft x 25.4mm/in = 175,260mm.

No. of quarters = 175,260 / 1.55mm/quarter.

= 113,071 quarters.

Mass of coins = 113,071 x 5.67g = 641,112g = 641.1kg.