A and B working together completed a job in 5 days. If A works twice as efficiently as he actually did and B works $$\frac{1}{3}$$ of actual efficiency, the work would have completed in 3 days. Find the for A to complete the job alone.

A and B working together completed a job in 5 days. If A works twice a

1.	A and B working together completed a job in 5 days. If A works twice as efficiently as he actually did and B works $$\frac{1}{3}$$ of actual efficiency, the work would have completed in 3 days. Find the for A to complete the job alone.
A.	$6\frac{1}{2}$$
B.	$6\frac{1}{4}$$
C.	$6\frac{3}{4}$$
D.	$12\frac{1}{2}$$
E.	one of these
Answer» C. $6\frac{3}{4}$$