Answer:
18. 1 to 4
Explanation:
18.
Areas = pi 2² : pi 4² = 4 : 16 = 1 : 4
1 to 4
19.
25 % = 125 oz
1 % = 125 ÷ 25 = 5 oz
To make it 10%, it needs to be reduced by 15%
15 % = 5 × 15 = 75 oz. I think it's impossible to do?
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