Time taken by A to complete the whole work alone = 20 days. time taken by B To complete the whole work alone = 20-4 = 16 days Let total work = 80 unit (LCM of 20 and 16) Efficiency of A= 80/20 = 4 units/day Efficiency of B = 80/ 16 = 5 Units/day. Efficiency of C = 0.5*4 = 2 units/ day Also B&C together worked for= X days. (4+5)*x+(5+2)*x = 80 16x=80 X=5 Therefore efficiency of D,= (X + 11)= 16 units / day Required. Time taken. = 80/16 = 5 days
When water itself combines chemically with some element or mineral it is called
Black lung disease occurs in people working in
The most reactive among the halogens is
Conduction band electrons have more mobility than holes because they
A powerful eye irritant present in smog is
Find the odd one:
The element used for making solar cells is
Which of the inert gases can form compounds?
Which of the following processes is used for the production of Biodiesel?
The function of skimming tank in sewage treatment is to remove
