16 men can do a piece of work in 16 days .4 days after they started the work, 8 more men joined them. How many days will they now take to complete the remaining work Choose the correct choice from the following answers
A) 7 days
B) 8 days
C) 9 days
D) 10 days
E) None of these
Solution:Work done by 1 man in 1 day=1/(16*16)   Work completed by 16 men in 4 days= 4[1/(16*16)]*16=1/4   Remaining work= 1- 1/4= 3/4   Total men now= 16+ 8= 
<gadget id="calculator">16+ 8</gadget>
<output>24</output>
24   24 men do 3/4 work=&gt;24*number of days*Work done by 1 man in 1 day=3/4   =&gt;24*number of days* 1/(16*16)=3/4   =&gt;number of days=8 days   Answer 8 days
<result>B</result>
16 men can do a piece of work in 16 days .4 days after they started the work, 8 more men joined them. How many days will they now take to complete the remaining work