Answer :
if a burritto is twice as much as water the the water is two dollars. if Ahmed spent 2/3 of his money then( 4+2=6) for burrito and water it means he had nine dollars originally so he is left with 3 dollars.
The burrito costs twice as much as water. Let's assume the water costs $w
$4=2w
w=$2
Ahmed spent $2+$4=$6
2/3 of the total amount = $6
Total amount =$6x3/2
=$9
$4=2w
w=$2
Ahmed spent $2+$4=$6
2/3 of the total amount = $6
Total amount =$6x3/2
=$9