There are 2 classes x 5 days = <<2*5=10>>10 classes on weekdays.

There are 4 classes x 2 days = <<4*2=8>>8 classes on weekends.

There are a total of 10 + 8 = <<10+8=18>>18 classes per week.

So each week, 18 x 5 = <<18*5=90>>90 people can take classes.

Thus, 90 x 3 = <<90*3=270>>270 people can take classes in 3 weeks.

# Answer

270
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The Diving Club offers 2 beginning diving classes on weekdays and 4 beginning classes on each day of the weekend. Each class has room for 5 people. How many people can take classes in 3 weeks?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
270
The Diving Club offers 2 beginning diving classes on weekdays and 4 beginning classes on each day of the weekend. Each class has room for 5 people. How many people can take classes in 3 weeks?
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