Katherine's junior takes 1/4*20 = <<1/4*20=5>>5 more hours to build a similar website as Katherine.

The total number of hours Katherine's junior takes to build a website is 20+5 = <<20+5=25>>25 hours.

If Katherine gave her junior 30 websites to build, her junior spent 30*25 = <<30*25=750>>750 hours on building the 30 websites.

# Answer

750
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
As a freelancer, Katherine takes 20 hours to develop a website for her clients. Her junior, Naomi, takes 1/4 times more time to complete creating a similar website. If many clients required her to build their websites in a particular year, and she gave her junior 30 websites to develop, calculate the total number of hours Katherine's junior took to create the 30 websites.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
750
As a freelancer, Katherine takes 20 hours to develop a website for her clients. Her junior, Naomi, takes 1/4 times more time to complete creating a similar website. If many clients required her to build their websites in a particular year, and she gave her junior 30 websites to develop, calculate the total number of hours Katherine's junior took to create the 30 websites.
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