The numbers are 15 and 3.
15 * 3 = 45
15 + 3 = 18
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15 and 3
3 & 15
(4 x 9) + (5 x 9) = (9 x 9)c= 81
20 + 45 = 65 20 x 45 = 900
"Sum" usually implies that you add at least two numbers together; not just one. For completeness sake, you might thing of the "sum of a single number" as the number itself.