To determine who spent more time writing per problem, we need to calculate the unit rate (minutes per problem) for each writer using the data provided.
Sonia's data:
- \( \frac{120 \text{ minutes}}{6 \text{ problems}} = 20 \text{ minutes/problem} \)
- \( \frac{360 \text{ minutes}}{18 \text{ problems}} = 20 \text{ minutes/problem} \)
- \( \frac{500 \text{ minutes}}{25 \text{ problems}} = 20 \text{ minutes/problem} \)
- \( \frac{1200 \text{ minutes}}{60 \text{ problems}} = 20 \text{ minutes/problem} \)
Sonia spent 20 minutes per problem.
Maryna's data:
- \( \frac{200 \text{ minutes}}{8 \text{ problems}} = 25 \text{ minutes/problem} \)
- \( \frac{375 \text{ minutes}}{15 \text{ problems}} = 25 \text{ minutes/problem} \)
- \( \frac{500 \text{ minutes}}{20 \text{ problems}} = 25 \text{ minutes/problem} \)
- \( \frac{1250 \text{ minutes}}{50 \text{ problems}} = 25 \text{ minutes/problem} \)
Maryna spent 25 minutes per problem.
Conclusion:
Maryna spent more time writing per problem at the unit rate of 25 min/problem.
The correct response is: Maryna spent more time writing per problem at the unit rate of 25 min/problem.