Consider the question. Nancy has a bag containing 22 tortilla chips. She gives 7 tortilla chips to her brother and 5 tortilla chips to her sister, keeping the rest for herself. How many did Nancy keep for herself?
 What is the step-by-step reasoning process to arrive at the answer: 10?
She gave away 7 + 5 = 12 chips. Then she kept 22 - 12 = 10.