How many survivers were there in the twin towers?

Answer 1

there where no survivors. :(

Thats not entirely accurate.

According to Wiki (and other sources):-

Survivors

Only 14 people escaped from the impact zone of the South Tower after it was hit and only four people from the floors above it. Individuals escaped from as high up on the South Tower as the 91st floor after initial impact. They escaped via Stairwell A, the only stairwell which had been left intact after the impact. It is speculated that Stairwell A in the South Tower was not only intact after the impact of United Airlines Flight 175, but that it was also passable until the South Tower collapsed at 9:59 AM. Since communication between 911 operators, FDNY and NYPD responders was disorganized, most individuals who were trapped were unaware of the passable status of Stairwell A and were instead told to wait for assistance by rescue personnel.[11] After the collapse of the towers, only 23 survivors who were in or below the towers escaped from the debris, including 15 rescue workers. The last Survivor to be removed alive from the WTC collapse debris was Genelle Guzman-McMillan, who was removed at 12:30 PM on September 12th, 27 hours after its initial collapse. She was a Port Authority employee who worked on the 64th floor of the North Tower.[12] A total of 6,294 people were reported to have been treated in area hospitals for injuries related to the 9/11 attacks in New York City.

Answer 2

after the twin tower was destroyed only 20 [approx] persons got out alive

Answer 3

10