question: Patricia has 30 roses. She gave 24 roses to her mother. She bought 15 more roses.  How many roses did she have now?
answer: Patricia had 30 - 24 = <<30-24=6>>6 roses left after she gave 24 roses to her mother.
  Therefore, she has 6 + 15 = <<6+15=21>>21 roses now.
  #### 21