Final answer:
The number with digit 6 in the ones place and 3 in the tens place is 36, making answer choice a) with 36 pieces the correct number of puzzle pieces in Phillip's puzzle.
Step-by-step explanation:
The question provided is asking us to identify the number of puzzle pieces in Phillip's puzzle based on the placement of digits within that number. We are told that the digit 6 is in the ones place, and the digit 3 is in the tens place. With these positions in mind, we can construct the two-digit number by placing the 3 in front of the 6, as the tens place comes before the ones place in a number. Therefore, the correct number of puzzle pieces in Phillip's puzzle is 36, which corresponds to option a).