Orlan gave one-fourth of his 20-meter rope to Allan. He then gave two-thirds of the remaining to Jack. How many meters of rope is left to Orlan? Let's think first. Chain of thought:
Orlan gave Allan 20 x 1 / 4 = 5 meters of rope. So he had 20 - 5 = 15 meters left. Then he gave 15 x 2 / 3 = 10 meters of the rope to Jack. Therefore, Orlan is left with 15 - 10 = 5 meters of rope.
Therefore, the answer is 5.