one men and three women working 7 hours a day finish a work in 5 days. Four men and four women working 3 hours a day complete the work in 7 days. The number of days in which only 7 men working 4 hours a day will finish the work is? Choose the correct choice from the following choices.
A) 4 days	B) 5 days	C) 6 days	D) 7 days	E) 8 days
1M + 3W ----- 35 h   4M + 4W ------- 21 h   7M -------? d   35M + 105W = 84M +84M   21W = 49M   4 * 35 = 7 * x =&gt; x = 20 hours   20/4= 
<gadget id="calculator">20/4</gadget>
<output>5</output>
5 days   ANSWER:5 days
<result>B</result>
one men and three women working 7 hours a day finish a work in 5 days. Four men and four women working 3 hours a day complete the work in 7 days. The number of days in which only 7 men working 4 hours a day will finish the work is?