Ahmed spent 1/3 of his money on a burrito and a water bottle. The burrito cost 2 times as much as the water. The burrito cost $4 and 2 times as much as the water, so, the water is the burrito cost divided by 2 , Water=$4/2=$2 So, water + burrito =$2+$4=$ 6 This $ 6 is 1/3 of the money, Ahmed have left 2/3 of the money ( 1- 1/3)