Crackers contain 15 calories each and cookies contain 50 calories each. If Jimmy eats 7 cookies, how many crackers does he need to eat to have consumed a total of 500 calories?
He has consumed 7 * 50 = <<7*50=350>>350 calories from the cookies.
He needs to consume 500 - 350 = <<500-350=150>>150 more calories.
He should eat 150 / 15 = <<150/15=10>>10 crackers.
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