For 12: 4, 6, 12
For 21: 21
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10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35
Combination of two or more materials
You can solve this by taking 12/21 and multiplying by 100. So, 12/21 = .571 * 100 = 57.1%
21-9 = 12
12*21 = 252