-21
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3 & 7? Sum 10, difference 4 so ratio 5:2 or 1 & 21? Sum = 22, difference 20 so ratio 11:10
It makes no difference in which order you mutliply these. You must calculate 15 squared first though. E.G. 1 * 22 * 3 is the same as, for instance, 22 * 3 * 1.
14. It's because 22-8 =14
22 can be divided evenly by: 1, 2, 11, 22
21+1=22 23-1=22 11x2=22 20+2=22 24-2=22, etc.