28 3s
To find out how many 3s go into 140, divide 140 by 3. This gives you approximately 46.67. Since we're looking for whole 3s, you can fit 46 complete 3s into 140.
16
9
4
37.6666667
2,560
24 of them
There are: 21/3 = 7
3000/3 = 1000
203
There are 29 3s because there also a 3 in the how many 3s are in 83333333333333333333333333333