Question

BIG POINTS My sister is 16 years old. My brother says that his age minus eighteen is equal to my sister's age. How old is my brother? Write a equation with b as variable.

Answer 1

Hello!

The sister's age is 16, the brother's age is his age minus 18.

The equation would be:

B - 18 = 16

Use the opposite operation -- add 18

18 + 16 = 34

B = 34

A N S W E R:

The brother is 34 years old.

Answer 2

b= brother's age
B-18=16
Since he said his age minus 18 is your sister, and your sister 16.
All you have to do is add 18 to 16 to find your brother's age.
34=B