If a * * * length 18m, yellow rope length 10m and red rope length 8m. If it is 18m long, yellow rope is 18m, red rope is 16m or red rope is 18m, and yellow rope is 16m.

In the first case, if you subtract 2m from the yellow rope, it will be as long as the red rope. If two red ropes are 18-2 = 16m, then one red rope is 8m (8+8 = 16). The length of yellow rope is 8+2 =10m.