6 men and 12 boys finish a job in 12 days, 12 men and 12 boys finish it in 10 days. 10 men and 10 boys shall finish it in how many days?  Options:
A) 12 days  B) 11 days  C) 14 days  D) 16 days  E) 18 days
6M + 12B ----- 12 days   12M + 12B ------- 10 days   10M + 10B -------?   72M + 144B = 120M +120B   24B = 48M =&gt; 2M = B   3B + 12B = 15B ---- 12 days   5B + 10B 3  + 12= 
<gadget id="calculator">3  + 12</gadget>
<output>15</output>
15B ---- 12 days   5B + 10B = 15B -----?   5  + 10= 
<gadget id="calculator">  5  + 10</gadget>
<output>15</output>
15B -----?=&gt; 12 days   12 daysNSWER:12 days
<result>A</result>
6 men and 12 boys finish a job in 12 days, 12 men and 12 boys finish it in 10 days. 10 men and 10 boys shall finish it in how many days?