Answer:
You can buy 16 bottles of water for $28 at a rate of $7 for 4 bottles.
First, determine the cost per bottle by dividing the total cost by the number of bottles:
$7 / 4 bottles = $1.75 per bottle
Then, divide the amount of money you want to spend by the cost per bottle:
$28 / $1.75 per bottle = 16 bottles
Thus, at the rate of $7 for 4 bottles, you can buy 16 bottles of water for $28.