A watermelon farm produced 120 baby watermelons. Ashlyn went to the farm after two months and found out that 30% of the watermelons were ready for harvest, so she took them home. When she came back two weeks later, 3/4 of the remaining melons were ready, so she harvested them. How many melons were not ready to be harvested after the two weeks?
When Ashlyn found out that 30% of the melons were ready, she took home 30/100 *120 = 
<gadget id="calculator">30/100*120</gadget>
<output>36</output>
36 watermelons.
The number of watermelons remaining on the farm is 120-36 =
<gadget id="calculator">120-36</gadget>
<output>84</output>
84.
When she returned two weeks later, she found that 3/4*84 = 
<gadget id="calculator">3/4*84</gadget>
<output>63</output>
63 were ready for harvest,
The number of watermelons that were not ready is 84-63 =
<gadget id="calculator">84-63</gadget>
<output>21</output>
21.

<result>21</result>