A student is mixing oil and water as part of an experiment. The student's mixture has a 5:3 oil to water ratio. If the student used 12 more units of oil than water, how many units of water were used?
Choose the most appropriate option:
A) 14
B) 18
C) 19
D) 22
E) 24
Let 5u and 3u be the units of oil and water, respectively   5u - 3u = 12   2u = 12 =&gt; u = 6   Water =&gt; 3u = 18   Answer: 18
<result>B</result>
A student is mixing oil and water as part of an experiment. The student's mixture has a 5:3 oil to water ratio. If the student used 12 more units of oil than water, how many units of water were used?