Well, darling, the difference between 21 and 15 is simply 6. It's like asking the difference between a kitten and a lion - one's cute and cuddly, the other might eat you for breakfast. So, in math terms, 21 minus 15 equals 6. Ta-da!
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36 - 21 = 1536 - 21 = 1536 - 21 = 1536 - 21 = 15
21 is the answer
14
17.
The difference between two numbers is the biggest minus the smallest, in this case 15-1 = 14