The second cooler is 100*.5=<<100*.5=50>>50 liters bigger than the first

So it is 100+50=<<100+50=150>>150 liters

The third is 150/2=<<150/2=75>>75 liters

So the total water they can hold is 100+150+75=<<100+150+75=325>>325 liters

# Answer

325
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John buys 3 different coolers.  The first one is 100 liters.  The second is 50% bigger than that and the third is half the size of the second.  How much total water can they hold?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
325
John buys 3 different coolers.  The first one is 100 liters.  The second is 50% bigger than that and the third is half the size of the second.  How much total water can they hold?
train