Answer :

3/10. Percent=for every 100.
if you say 3/10, add a zero to 10 and 3, so it would look ike 30/100. He drank 30% of the Milk.

Hope this helps
Steps:
1. Do a proportion
3/10 times x/100
2. 3 times 100 is 300
3. 300 divided by 10 is 30
4. Your answer is
30%

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