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?
Nicole ate 2/5 of the total number of cookies, which is 2/5*600= 
<gadget id="calculator">2/5*600</gadget>
<output>240</output>
240.
The total number of cookies that remained in the box after Nicole ate 240 is 600-240 = 
<gadget id="calculator">600-240</gadget>
<output>360</output>
360.
Eduardo then ate 3/5 of the remaining cookies, a total of 3/5*360 = 
<gadget id="calculator">3/5*360</gadget>
<output>216</output>
216 cookies.
The total number of cookies that remained after Eduardo ate 216 is 360 - 216 = 
<gadget id="calculator">360-216</gadget>
<output>144</output>
144.
The percentage of the cookies that remained out of the original amount is 144/600*100% = 24%

<result>24</result>