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If Jane can finish her work assignment in half an hour, what part of it can she finish in 20 minutes?

Explanation

To solve this problem, set up a proportion. First, make sure that you use the same time measurement throughout the problem. Convert 1 hour = 30 minutes. The proportion of this problem is \(\frac{1 \text { job }}{30 \text { minutes }}=\frac{x(\text { part of the job })}{20 \text { minutes }}\)

Cross multiply to find \(30 x=20 \Rightarrow x=\frac{2}{3}\)

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