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In a two-digit number, the sum of digits is (12) and the tens digit is (4) more than the units digit. What is the number?

Answer and explanation

Correct answer: (84)

The direct answer is option A, 84. Let x be the tens digit and y be the units digit. The statements give x+y=12 and x-y=4. Adding them gives 2x=16, so x=8. Then 8+y=12, so y=4. The number formed is 84. Option A is correct because its digit sum is 8+4=12 and its tens digit exceeds its units digit by 8-4=4. Option B, 75, has sum 12, but its difference is 2. Option C, 93, has sum 12, but its difference is 6. Option D, 66, has sum 12, but the tens digit is not 4 greater; the difference is zero. The order matters: the tens digit must be the larger digit. Exam cue: add sum and difference equations to get twice the tens digit.

Related tags

Linear EquationsWord ProblemDigitsHardClass 10

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