Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
She gave away 7 + 5 = 12 chips. Then she kept 22 - 12 = 10. Final answer: 10.