Aptitude Hack#33(28-3-19)

Question:

5 skilled workers can build a wall in 20 days; 8 semi-skilled workers can build a wall in 25 days; 10 unskilled workers can build a wall in 30 days. If a team has 2 skilled, 6 semi-skilled and 5 unskilled workers, how long will it take to build the wall?

A) 20 days
B) 18 days
C) 16 days
D) 15 days