Well, darling, 200 divided by 21 is 9 with a remainder of 11. So, technically speaking, the answer is 9.47, but we don't need to get all fancy with decimals here. Just know that you can fit 9 whole 21s into 200, and then you're left with a pesky little 11 hanging out at the end. Hope that clears things up for you, sugar!
200.6562
200
? Divided by 9 = 200
0.5kg divided 200 = 0.0025
31 divided 200 = 0.155
200 divided in the ratio of 19 = 10.526315789473685
1
2.8571
16.6667
50
0.4082
0.125