19 men and 12 boys finish a job in 3 days, 7 men and 7 boys finish it in 10 days. 10 men and 10 boys shall finish it in how many days?  Choose one
A) 03  B) 05  C) 12  D) 17  E) 12
19 M + 12 B ----- 03 days   13 M + 13 B ------- 10 days   18 M + 18 B -------?   247 M +156 B = 234 M +234 B   78 B = 13 M =&gt; 1 M = 6 B   114 B + 12 B = 126 B ---- 03 days   108 B + 18 B = 126 B -----? =&gt; 03 days   03nswer: 03
<result>A</result>
19 men and 12 boys finish a job in 3 days, 7 men and 7 boys finish it in 10 days. 10 men and 10 boys shall finish it in how many days?