Stream of consciousness rationale: He spend $1.5 on soda because 2 - .5 = 1.5. He bought 6 ounces of soda because 1.5 / .25 = 6.
The question and answer pair are described below.
Q: Peter goes to the store to buy a soda. The soda costs $.25 an ounce. He brought $2 with him and leaves with $.50. How many ounces of soda did he buy?
A: 6