Question

ans is 14 .. any1 here knws how to solve such type

Answer 1

ya......
$xy \div xy + 4444$

Answer 2

Given A,B,C can fill together a tank in 6 hours.

(A + B + C)'s 1-hour work = 1/6.

Given that After working together for 2 hours, C is closed.

(A + B + C)'s 2-hour work = 2/6.

                                           = 1/3.



Given that A and B can fill a remaining part in 7 hours.

(A + B)'s 7-hours work = 1 - 1/3

                                      = 2/3.


Then,

(A + B)'s 1-hour work = 2/3 * 7

                                   = 2/21.


Now,

The c's 1- hour work = 1/6 - 2/21

                                   = 3/42

                                   = 1/14.




Therefore C alone can fill the tank in 14 hours.



Hope this helps!