human
If Ann is 9 years old and her brother is twice her age, how old will her brother be in 3 years?
assistant
How old is Ann's brother now? ** Ann's brother is 9 * 2 = <<9*2=18>>18 years old now.
How old will Ann's brother be in 3 years? ** This means, in 3 years, her brother will be 18 + 3 = <<18+3=21>>21 years old.
#### 21