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Mathematics
OpenStudy (anonymous):

You estimate that you can do 12 Math Problems in 45 min. How long to do 20 math problems?

OpenStudy (shadowfiend):

You can say, basically, that: \[\frac{12\text{ problems}}{45\text{ minutes}} = \frac{20\text{ problems}}{x\text{ minutes}}\] Do you know how to solve that?

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