A contractor undertook to finish a job in 150 days and employed 200 men. After 50 days he found that only 1/4 of work was finished. How many extra days are needed if he employs 50 more men? Choose the correct answer.
A) 20	B) 25	C) 30	D) 35	E) 45
work part 20=25% and work part B= 75%   25% work done by 200 people in 50 days   if only one employee works then he takes  200*50= 
<gadget id="calculator"> 200*50</gadget>
<output>10_000</output>
10000 days   and if work(B) is triple more ten he will take=10000*3= 
<gadget id="calculator">10000*3</gadget>
<output>30_000</output>
30000 days   if employees are 250 then days= 30000/250= 
<gadget id="calculator">30000/250</gadget>
<output>120</output>
120days   then total days= 50+120= 
<gadget id="calculator">50+120</gadget>
<output>170</output>
170 days   how many extra days taken= 170-150= 
<gadget id="calculator">170-150</gadget>
<output>20</output>
20 days   20NSWER:20
<result>A</result>
A contractor undertook to finish a job in 150 days and employed 200 men. After 50 days he found that only 1/4 of work was finished. How many extra days are needed if he employs 50 more men?