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?
Orlan gave Allan 20 x 1/4 = 
<gadget id="calculator">20*1/4</gadget>
<output>5</output>
5 meters of rope.
So he had 20 - 5 = 
<gadget id="calculator">20-5</gadget>
<output>15</output>
15 meters left.
Then he gave 15 x 2/3 = 
<gadget id="calculator">15*2/3</gadget>
<output>10</output>
10 meters of the rope to Jack.
Therefore, Orlan is left with 15 - 10 = 
<gadget id="calculator">15-10</gadget>
<output>5</output>
5 meters of rope.

<result>5</result>