<human>:  If Martin eats Cheerios every day for breakfast, he'll lose 1.25 pounds/week. If he eats donuts every day for breakfast, he'll gain 1.75 pounds/week. What will be the difference in his weight at the end of 5 weeks between the two breakfast options?
<bot>: How much weight will Martin gain if he eats donuts for breakfast? ** First find the difference in weight gain per week: 1.75 pounds/week - ( -1.25 pounds/week) = 1.75 pounds/week + 1.25 pounds/week = <<1.75-(-1.25)=3>>3 pounds/week
How much weight will Martin gain if he eats donuts for breakfast? ** Then multiply the weight gain per week by the number of weeks to find the total difference at the end of 5 weeks: 5 weeks * 3 pounds/week = <<5*3=15>>15 pounds
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