5 men and 11 boys finish a job in 13 days, 11 men and 11 boys finish it in 10 days. 6 men and 6 boys shall finish it in how many days?
Select.
A) 12
B) 17
C) 10
D) 13
E) 18
5 M + 11 B ----- 13 days   11 M + 11 B ------- 10 days   06 M + 06 B -------?   55 M + 121 B = 66 M +66 B   55 B = 11 M =&gt; 5 B = 1 M   25 B + 11 B = 36 B ---- 13 days   30 B + 6 B = 36 B -----? =&gt; 13 days   Answer: 13
<result>D</result>
5 men and 11 boys finish a job in 13 days, 11 men and 11 boys finish it in 10 days. 6 men and 6 boys shall finish it in how many days?