Hello there!
The information given to us is:
- The mixture has 30% alcohol
- There is 16 quarts of it
One way to do it:
Multiply 30% by 16 to get what 30% of 16 is.
30% * 16 = 4.8
Another way to do it:
What is 10% of 16?
10% of 16 is 1.6, because 10 of 1.6 is 16.
How many 10%s become 30%?
3 10%s make a 30%.
Since 10% = 1.6, and 3 10%s make 30%, 3 1.6s must make 30%.
3 1.6s is 4.8, because 1.6 + 1.6 + 1.6 = 4.8.
Therefore, your answer is 4.8 quarts.