What number am I? I have two digits. I have zero ones. I have three tens.
We’re looking for a number. And we’re given three clues. First, we’re told that this is a two-digit number. So we know this is going to be a number with a tens digit and a ones digit. Next, we’re told how many ones the number has. It has zero ones. So we can write a zero in the ones place. And our final clue is that our number has three tens. So we can write a three in the tens place.
The number which has two digits, zero ones, and three tens is number 30.