The percentage for women is 100% - 70% = 30%.

Since 180 represents 30%, then 180/30 = 6 students represent 1%.

Hence, 6 x 70 = <<6*70=420>>420 students are men.

# Answer

420
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In the engineering department, 70% of the students are men and 180 are women. How many men are there?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
420
In the engineering department, 70% of the students are men and 180 are women. How many men are there?
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