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