Please answer the following question by reasoning step-by-step.
Ali has $480. He spent half of it on food, and then he spent a third of what was left on a pair of glasses. How much money did he have left?

160
Ali spent 480 / 2 = $240 on food.

After buying the food, Ali had 480 - 240 = $240 left.

He spent 240 / 3 = 80 dollars on a pair of glasses.

He had 240 - 80 = $160 left.

.

The answer is 160