I'll give you a question, please answer with step-by-step reasoning process.
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?

3
The family needs 3 gallons of water because 6 x.

5 = 3.

It will cost $3 because 3 x 1 = 3.

.

The answer is 3