Multiple choice general knowledge math & puzzles

The digit in the unit's place of a number is equal to the digit in the ten's place of half of that number and the digit in the ten's place of that number is less than the digit in the unit's place of half of that number by 1. If the sum of the digits of the number is 7, then what is the number?

  1. 34

  2. 52

  3. 162

  4. data inadequate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the number be 10a + b where a is tens digit and b is units digit. Half of 52 is 26. The units digit of 52 (which is 2) equals the tens digit of 26 (which is 2). Also, the tens digit of 52 (which is 5) equals the units digit of 26 (which is 6) minus 1. The sum of digits 5 + 2 = 7. All conditions are satisfied.

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