Martha's age 2/3 of her brother's age. Martha is 24 years old now. How old is her brother?

Martha's age 2/3 of her brother's age. Martha is 24 years old now. How old is her brother?

Let her brother's age be b. We're given:
2b/3 = 24

To solve this proportion for b, we type it in our search engine and we get:
b = 36