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? Let's be accurate as possible.
He has consumed 7 * 50 = 350 calories from the cookies. He needs to consume 500 - 350 = 150 more calories. He should eat 150 / 15 = 10 crackers.
The answer: 10.