A contractor undertakes to do a job within 100 days and hires 10 people to do it. After 20 days, he realizes that one fourth of the work is done so he fires 2 people. In how many more days Q will the work get over?  Select the correct option.
A) Q=60 B) Q=70 C) Q=75 D) 80 E) 100
We can also use the concept of man-days here   100 days --&gt;10men so the job includes 100*10= 
<gadget id="calculator">100*10</gadget>
<output>1_000</output>
1000 man-days   After 20 days   1/4 of Job is completed so 1/4 X 1000 man-days=250 man-days Job is done   Now the Balance Job=1000-250= 
<gadget id="calculator">1000-250</gadget>
<output>750</output>
750 man-days worth of Job   Since 2 men are fired so B/L men=8   Therefore Total no. of days of Job=750 man-day/8 days = 375/4=94 days (approx.)   Now since this is total and Ques. is asking for additional no. of days,   So 94-20= 
<gadget id="calculator">94-20</gadget>
<output>74</output>
74 days   The nearest approx. to answer is 75   Ans: Q=75 (75 days)
<result>C</result>
A contractor undertakes to do a job within 100 days and hires 10 people to do it. After 20 days, he realizes that one fourth of the work is done so he fires 2 people. In how many more days Q will the work get over?