Last week, I focused on rate problems involving speed (if you’re looking to the answer to last week’s challenge question, scroll down to the end of this post!). This week, I’m going to shift to work-rate problems, which some students find even more challenging. You know these problems… the ones that say something ridiculous like: A cyborg can pet a kitten 150 times in 2 minutes. A ninja pets a kitten at half the rate… Read more

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