Jillian had 80 oranges which she had bought to give to her friends. She divided each orange into ten equal pieces for each friend to get four pieces. How many friends were there? Let's think first. Chain of thought:
If she divided each orange into 10 pieces, she got 80 * 10 = 800 pieces of orange. Since each friend received 4 pieces, there were 800 / 4 = 200 friends.
Therefore, the answer is 200.