To determine who spent more time writing per problem, we need to compare the unit rates provided for both Maryna and Sonia.
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Maryna's rate: 1 min for 25 problems which simplifies to: \[ \frac{1 \text{ min}}{25 \text{ problems}} = 0.04 \text{ min/problem} \]
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Sonia's rate: 20 min for 1 problem which simplifies to: \[ \frac{20 \text{ min}}{1 \text{ problem}} = 20 \text{ min/problem} \]
Now we compare the rates:
- Maryna's unit rate: \(0.04 \text{ min/problem}\)
- Sonia's unit rate: \(20 \text{ min/problem}\)
Since \(0.04\) is much less than \(20\), Maryna spent less time writing per problem, while Sonia spent significantly more time writing per problem.
Based on the responses provided:
- The correct response is "Maryna spent less time writing per problem at the unit rate of 1 min. 25 problems."