Seven men and four boys can complete a work in 6 days. A man completes double the work than a boy. In how many days will 5 men and 4 boys complete the work?	Choose the correct choice from the following choices.
A) 5 B) 4 C) 6 D) Cannot be determined E) None of these
M = 2B   ∴ 7M + 4B = 14B + 4B = 18B   5M + 4B 14  + 4= 
<gadget id="calculator">14  + 4</gadget>
<output>18</output>
18B   5M + 4B= 10B + 4B = 14B   ∴ 18 boys complete the work in 6 days.   ∴ 14 boys complete the work in   6×18/1410  + 4= 
<gadget id="calculator">10  + 4</gadget>
<output>14</output>
14B   ∴ 18 boys complete the work in 6 days.   ∴ 14 boys complete the work in   6×18/14=7 5/7days   Note: 7 men and 4 boys complete the work in 6 days. We have to find out the no. of days in which 5 men and 4 boys complete the work. Here, we see that 4 boys are common in both the cases, therefore, 5 men will take more time to complete the work, i.e., more than 6 days, which is not given in any options. Therefore, without calculating we can say that our answer is(e).   Answer None of these
<result>E</result>
Seven men and four boys can complete a work in 6 days. A man completes double the work than a boy. In how many days will 5 men and 4 boys complete the work?