Patricia has 30 roses. She gave 24 roses to her mother. She bought 15 more roses.  How many roses did she have now?
Patricia had 30 - 24 = 
<gadget id="calculator">30-24</gadget>
<output>6</output>
6 roses left after she gave 24 roses to her mother.
Therefore, she has 6 + 15 = 
<gadget id="calculator">6+15</gadget>
<output>21</output>
21 roses now.

<result>21</result>