human
In India, it cost $1 to purify a gallon of fresh water. Each person needs 1/2 a gallon of fresh water a day. In a family of 6, how much will it cost for fresh water for the day?
assistant
How many gallons of water does the family need? ** The family needs 3 gallons of water because 6 x .5 = <<6*.5=3>>3
How much will it cost? ** It will cost $3 because 3 x 1 = <<3*1=3>>3
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