Nicole ate 2/5 of the total number of cookies, which is 2/5*600= <<2/5*600=240>>240

The total number of cookies that remained in the box after Nicole ate 240 is 600-240 = <<600-240=360>>360

Eduardo then ate 3/5 of the remaining cookies, a total of 3/5*360 = <<3/5*360=216>>216 cookies

The total number of cookies that remained after Eduardo ate 216 is 360 - 216 = <<360-216=144>>144

The percentage of the cookies that remained out of the original amount is 144/600*100% = 24%

# Answer

24
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There were 600 cookies in a box. Nicole ate 2/5 of the total number of cookies, while Eduardo ate 3/5 of the remaining amount. What percentage of the original cookies remained?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
24
There were 600 cookies in a box. Nicole ate 2/5 of the total number of cookies, while Eduardo ate 3/5 of the remaining amount. What percentage of the original cookies remained?
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