When he closed 1/4 of the tabs, he closed 1/4*400 = <<400*1/4=100>>100 tabs.

The number of windows tabs that remained open is 400-100 = <<400-100=300>>300

After reading some news from different pages, he closed 2/5 of the remaining tabs, a total of 2/5*300 = <<2/5*300=120>>120 pages.

The number of tabs that remained open is 300-120 = <<300-120=180>>180

If he closed half of the remaining tabs after further analyzing some pages, he closed a total of 1/2*180 = <<180/2=90>>90 pages.

The total number of tabs that remained opened is 180-90 = <<180-90=90>>90

# Answer

90
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Jose had 400 tabs opened up in his windows browser. After about one hour of browsing, he closed 1/4 of the tabs to allows easy browsing. He read some news from different pages, then closed 2/5 of the remaining tabs. If he closed half of the remaining tabs after further analyzing some pages, how many windows tabs did he have remaining open?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
90
Jose had 400 tabs opened up in his windows browser. After about one hour of browsing, he closed 1/4 of the tabs to allows easy browsing. He read some news from different pages, then closed 2/5 of the remaining tabs. If he closed half of the remaining tabs after further analyzing some pages, how many windows tabs did he have remaining open?
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