haha, how many marbles in the jar
i remember this nerdy kid, measuriin the height and width with his hand on the jar. then he would measure his hand with a tape ruler. then he would figure the radius of the marbles. and get the answer
one way with those coins is to weigh all of each coin, then weigh one coin, and divide.
if i knew the weight of all of each coins? id give you a good estimate.