It is: 81
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The sum of 162 and 81 is 243.
81/100 = 162/200 and 243/300
81, 162, 243, 324, 405, 486, 567, 648, 729, 810, 891, 972.
The factors of 486 are 1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 243, and 486. 1 x 486 = 486; 2 x 243 = 486; 3 x 162 = 486; 6 x 81 = 486; etc.
27, 54, 81, 108, 135, 162, 189, 216, 243, 270, 297, 324, 351, 378, . . .