###Human: Ivanka wrote a book that took her 3 more months than it took Woody to write a book. Woody spent 1.5 years writing his book. How many months in total did Ivanka and Woody need to write their books?, ### Assistant: Woody = 1.5 years = 18 months
Ivanka = 18 + 3 = 21 months
18 + 21 = 39 months
It took Ivanka and Woody 39 months to write their books. 
 So the answer is :  39