There are 4*7=<<4*7=28>>28 days in those 4 weeks

That means he takes 28/2=<<28/2=14>>14 showers

So he takes a total of 14*10=<<14*10=140>>140 minutes of showers

So he uses 2*140=<<2*140=280>>280 gallons of water

# Answer

280
<|im_start|>system
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<|im_start|>user
John takes a 10-minute shower every other day for 4 weeks. If his shower uses 2 gallons of water per minute.  How much water does he use in those 4 weeks?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
280
John takes a 10-minute shower every other day for 4 weeks. If his shower uses 2 gallons of water per minute.  How much water does he use in those 4 weeks?
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