Give the step-by-step reasoning process and then the final answer. Patricia is growing her long very long to donate it to a charity that makes wigs for cancer survivors. Her hair is 14 inches long. She needs to donate 23 inches to make a wig. She wants her hair to be 12 inches long after the donation. How much longer does she have to grow her hair?
Her hair needs to be 35 inches long when she cuts it because 23 + 12 = 35. She needs to grow it 21 more inches because 35 - 14 = 21.
The final answer: 21.