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?
Please reason step by step, and put your final answer within \boxed{}.
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