In a vehicle's repair shed, 3 men and 8 boys can do a piece of work in 15 days; 4 men and 9 boys can do the same work in 12 days. Then, 5 men and 5 boys can do double the amount of this work in :  Pick one:	A) 20 days	B) 33 days	C) 24 days	D) 28 days	E) None of these
Explanation :   Solution: (3*15) men + (8*15) boys= (4*12) men + (9*12) boys   45 M + 120 B = 48 M+ 108 B &lt;=&gt; 3 M = 12 B =&gt; 1 M = 4 B.   .'. 3 M + 8 B = (3*4) B+ 8 B = 20 B.   5 M + 5 B (3*4)  + 8= 
<gadget id="calculator">(3*4)  + 8</gadget>
<output>20</output>
20 B.   5 M + 5 B= (5*4) B + 5 B = 25 B.   Let the required number of days be x.   now, more boys, less days (IP)   more work, more days (DP)   boys 25 : 20   } : :15: x   work 1 : 2   .'. (25*1*x) = (20*2*15)   =&gt; x = 40*15/25= 
<gadget id="calculator">40*15/25</gadget>
<output>24</output>
24.   Answer : 24 days
<result>C</result>
In a vehicle's repair shed, 3 men and 8 boys can do a piece of work in 15 days; 4 men and 9 boys can do the same work in 12 days. Then, 5 men and 5 boys can do double the amount of this work in :