Please answer the following question by reasoning step-by-step.
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?

10
She gave away 7 + 5 = 12 chips.

Then she kept 22 - 12 = 10.

.

Final answer: 10