It is so very simple and quick to get the answer, especially since, if you need it, you can use the calculator that comes with your computer. But since you are obviously not able to do so, the answer is 20/9 = 2.222....
There are 20 nickels in a dollar so $9 = 9*20 = 180 nickels.
9
20 with remainder 9.
9 kg 20 g = 9020 g
9 x 20 = 180
2
20 of them
The answer is 20C9 = 20!/[9!*11!] = 167,960
20 with 9 remaining 429 - 9 = 420 = 21 x 20
There are 167960 9 digits combinations between numbers 1 and 20.
Nine times.
9