The sum of 198 and 253 is 451.
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198.
Let 'S' represent the sum. Then the equation isS = 198 + 65
45+54=99 99*2=198 198 is the answer.
65, 66, 67
7272 * * * * * WRONG! Sum from 23 to 123 = (sum from 1 to 123) minus (sum from 1 to 22) = 123*124/2 - 22*23/2 = 7626 - 253 = 7373. NOT 7272!