s lot of it
According to the US Mint, the quarter dollar is 1.75mm thick.1.75mm x 1cm/10mm = 0.175cmSave0.175cm x 1in/2.54cm = 0.0689in1in/0.0689in = 14.5 quarters to make a stack 1 in highObviously you can't stack 14.5 quarters. 15 quarters makes a stack 1.03in high. 14 quarters make a stack 0.965in high.
100 trillion
A foot is 12*25.4 mm and a quarter is 1.75 mm thick so you will need 12*25.4/1.75 quarters = 174.2 of them.
Do you still need the answer? There is a way to work it
Because there are 4 quarters in $1, you can conclude that there are 20 quarters in $5. You would need 21 quarters to get $5.25.
You need 7 quarters, which works out at 1.75 in total.
It would take approximately 1.3 trillion pennies stacked on top of each other to reach the moon, assuming the average height of a stacked penny is 0.75 inches.
You could do it with 53 quarters and 8 dimes. Many other combinations are possible.
You can't reach it from below. You will need the key to the Living Quarters, which is in the Production Zone at the far right of the island. You can reach the tightrope and the Mech Crank by entering the Living Quarters and exiting at the top door (visible at the right of the vine). (see related question)
You will need 960 US quarters to equal 12 pounds in weight.
40