<human>:  Toby is making toast and adding peanut butter to it. He wants to make sure he has 500 calories for breakfast. A piece of bread has 100 calories. A serving of peanut butter has 200 calories. If he has one piece of bread, how many servings of peanut butter should he add?
<bot>: How many calories does Toby need? ** He needs 400 calories worth of peanut butter because 500 - 100 = <<500-100=400>>400
How many servings of peanut butter does Toby need? ** He needs 2 servings of peanut butter because 400 / 200 = <<400/200=2>>2
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