Question

My sister is 16 years old. My brother says that his age minus fifteen is equal to my sister's age. How old is my brother?

Enter an equation, using b as your variable, to find how old my brother is.

The equation is

My brother is
years old.

Answer 1

b-15=16

31

Explanation:

Because if your sister is 16 and your brother is that age minus 15 that is her sister's age which means his age (variable); minus how much older: equals her age