A textbook has 1,000 pages.  How many of the pages have page numbers whose digits add up to exactly 4?
Question:
A textbook has 1,000 pages.  How many of the pages have page numbers whose digits add up to exactly 4?
Answer:
Let's think step by step.

user
15
A textbook has 1,000 pages.  How many of the pages have page numbers whose digits add up to exactly 4?
train