39
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39, because when you subtract 20 you get forty but when you subtract another number, you get 39.
-60
21
You can subtract 2 from 21 a total of 10 times. This is because each time you subtract 2, you are left with 19, and you can repeat the process until you reach 1. Mathematically, this can be represented as 21 - 2 = 19, 19 - 2 = 17, and so on until you reach 1.
10 times
0.0167