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The sum of digits of a 2 digit number is 7. If digits are interchanged the new number formed is less than four times of original number. (use 2 vaiables)

Let the original number be 10a + b. given, a+b=7 now, according to question, 10b+a<4(10a+b) solving, a>42/45 b<273/45 so a can be any natural number from 1 to 9, b can be any whole number less than 6.