Answer:
Lol, do you still need the answer? If you do, here it is:
The equation is : X+Y=21, X+Y+21 can be the following options:
1+20=21
2+19=21
3+18=21
4+17=21
5+16=21
6+15=21
7+14=21
8+13=21
9+12=21
10+11=21
Hope this helps, and have a good day :D
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