Two friends, Anita and Sasha, are growing out their hair. How long will their hair be?

Question

Two friends, Anita and Sasha, are growing out their hair. They plan to cut it off at a certain point and donate it to a charity that makes wigs for people with cancer. Anita's hair is already 10 centimeters long and grows at a constant rate of 2 centimeters per month. Sasha's hair is 20 centimeters and growing at a speed of 1 centimeter per month. If the girls get their hair cut on a certain day, they will have exactly the same length to donate. How long will their hair be?

Answer 1

10 + 2n = 20 + n

10 + n = 20

n = 10

After 10 months, they will have 30