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?
The family needs 3 gallons of water because 6 x .5 = 
<gadget id="calculator">6*.5</gadget>
<output>3</output>
3.
It will cost $3 because 3 x 1 = 
<gadget id="calculator">3*1</gadget>
<output>3</output>
3.

<result>3</result>