Final answer:
Noah could have used 10, 12, or 14 apples to bake apple pies, as these are the numbers with the digit 1 in the tens place and an even number less than 5 in the ones place.
Step-by-step explanation:
The question asks us to find out the number of apples Noah could have used to bake apple pies, given that the number of apples has the digit 1 in the tens place and an even number less than 5 in the ones place. To solve this, we need to consider the possible even digits less than 5 for the ones place, which are 0, 2, and 4. Since the tens place is specified as 1, we simply place each of the even digits in the ones place to get the possible numbers of apples Noah could have used: 10, 12, and 14.