Question

My sister is 18 years old. My brother says that his age minus eighteen 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

36 years old or b-18 = 18

Explanation:

Since there is an 18 year difference between the brother and the sister, all you have to do is subtract 18 from how hold the brother is. Since we know that the age of the sister is 18, the equation needs to be equal to 18. Using this, we know the equation is b - 18 = 18. When we add 18 to both sides we get that b=36.

Answer 2

The brother is 36 years old.

Explanation:

b = brothers age

b - 18 = 18 | Given

b = 36 | Add 18 to both sides to cancel out -18 and get his age.