Ram completes 60% of a task in 15 days and then takes the help of Rahim and Rachel. Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is. In how many more days will they complete the work?
Choices
A) 5(5/7) days B) 6(5/7) days C) 7(5/7) days D) 5(4/7) days E) 3(5/7) days
ram completes 60% of work in 15 days   so ram 1 day work is 60% / 15= 4%   rahim is 50%efficient than ram   so rahim 1 day work is 2%   rachel is 50% efficient than rahim   so rachil 1day work is 1%   total work done by ram rahim and rachel in 1 day is 4%+2%+1% 60  / 15= 
<gadget id="calculator"> 60  / 15</gadget>
<output>4</output>
4%   rahim is 50%efficient than ram   so rahim 1 day work is 2%   rachel is 50% efficient than rahim   so rachil 1day work is 1%   total work done by ram rahim and rachel in 1 day is 4%+2%+1%= 7%   7%----- 1 day   40%---------?   40/7   so 5.7  4 +2 +1= 
<gadget id="calculator">  4 +2 +1</gadget>
<output>7</output>
7%   7%----- 1 day   40%---------?   40/7   so 5.7=6 days needed to complete the 40%of work   5(5/7) daysNSWER:5(5/7) days
<result>A</result>
Ram completes 60% of a task in 15 days and then takes the help of Rahim and Rachel. Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is. In how many more days will they complete the work?