To determine who spent more time writing per problem between Maryna and Sonia, we need to analyze the given statements.
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The first statement claims that "Maryna spent more time writing per problem" and mentions that she would spend 500 more minutes writing 100 problems than Sonia.
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The second statement says that "Sonia spent less time writing per problem" and states that Sonia would spend "8 1/3 less hours writing 100 problems than it would take Maryna."
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The third statement again asserts that "Sonia spent less time writing per problem" and claims that she would spend "500 less minutes writing 100 problems than it would take Maryna."
Based on the first and the third statements, it is clear that Maryna spends more time per problem. Furthermore, if she spends 500 more minutes on 100 problems than Sonia, then the conclusion that Maryna takes more time is solidified.
To summarize:
- Maryna: Takes more time per problem and would take 500 minutes more for 100 problems.
- Sonia: Takes less time per problem and would take 500 minutes less for 100 problems.
Consequently, if we want to know how much more time Maryna would take for writing 100 problems compared to Sonia, we see that it is indeed 500 minutes more.
So, the provided conclusion that "Maryna spent more time writing per problem" and she would spend "500 more minutes writing 100 problems than it would take Sonia" is accurate.