Reed always bakes two trays of cookies at a time in his oven. In his oven, two trays of cookies can bake in the same amount of time as one tray.
Yesterday, he baked cookies for 36 minutes. If it takes 12 minutes to bake one tray of cookies, how many trays of cookies did Reed bake yesterday?
If two trays take the same time as one tray, then it means Reed bakes two trays during the 12 minutes it takes to cook one tray. Therefore, Reed bakes two trays every 12 minutes, or one tray every 6 minutes.
To find out how many trays Reed baked in 36 minutes, we can divide 36 by 6:
36 ÷ 6 = 6
So Reed baked 6 trays of cookies yesterday.