How to solve:

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Write all numerators above the least common denominator which is 24 in this case.

Subtract the numbers

Alternate form: 0.458333
The final, simplified, fraction answer is:
3/8 cups of oil
Step by step explanation:
Given : A recipe requires 1/4 cup of oil for every 2/3 cup of water.
To Find: How much oil (in cups) is needed per cup of water?
Solution:
Oil required by 2/3 cup of water = 1/4
Oil required by 1 cup of water = 1/4
= 2/3
= 3/8
Hence cups of oil is needed for per cup of water.
When grades are expressed as a quantity of 1, such as two feet per second or 5 miles per hour, they are called unit rates.
You did it right because 12 x 2 = 24 x 8 = 192