By Long Multiplication
22
x13
220
+66
286
===== The Product !!!!
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Their average is 22 and their difference is 9 so use 22 and 9 13*31 = 222 - 92 = 484 - 81 = 403
52 = 2 x 2 x 13 OR 22 x 13
You need to look for 2 numbers which have a product of 156 and a difference of 1. First 156 can be written as a product of it's prime factors: 156 = 22 x 3 x 13. From this you can see that 22 x 3 = 12 and hence 12 x 13 = 156.
Both of these:52 = 2 x 2 x 1352 = 22 x 13
The product of 11 times 2 is 22