For March, April, September and October, she cuts her lawn 2 a month.

There are 4 months so she cuts her yard 2*4 = <<2*4=8>>8 times

For May, June, July and August, she cuts her lawn 4 times a month.

There are 4 months so she cuts her yard 4*4 = <<4*4=16>>16 times

During the entire 8 month period, she cuts her lawn 8+16 = <<8+16=24>>24 times

Every 4th time she cuts, she needs 2 gallons of gas.

If she cuts her lawn 24 times a year then she needs to fill up 24/4 = 6 times

Each time she fills up, it takes 2 gallons of gas so 2*6 = <<2*6=12>>12 gallons of gas per year

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Helen cuts her lawn starting in March and finishes in October.  Her lawn mower uses 2 gallons of gas every 4th time she cuts her lawn.  For March, April, September and October, she only cuts her law 2 times per month.  In May, June, July and August, she has to cut her lawn 4 times per month.  How many gallons of gas will she need to cut her lawn from March through October?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
Helen cuts her lawn starting in March and finishes in October.  Her lawn mower uses 2 gallons of gas every 4th time she cuts her lawn.  For March, April, September and October, she only cuts her law 2 times per month.  In May, June, July and August, she has to cut her lawn 4 times per month.  How many gallons of gas will she need to cut her lawn from March through October?
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