It depends on a number of factors, size of the female, also some strains have more young than others. I've personally seen anywhere from 10 to 35 fry dropped.
If it's a first time mother about 10 or 15. If it has had many litters they can have up to 200.
Up to 70 from one female, depending on her age/ size
A feeder guppy is a guppy that is sold or going to be fed to a fish. Guppies are commonly used for this because so many are born at one time, and are usually born once a month.
Once or twice a day
Once the baby guppies mature they can move in with the adults.
Any number of fry from 1 to 100 is common in guppies.
Yes
Yes
20 guppies in 8 gallon.
5 1/6= 5/30
Guppies are not extinct, and it is not very likely that they will go extinct, because they breed once a month and have up to 70 babies a month.
About 5 or 6 guppies.
How big are the two tanks, and how many guppies do you have
A Lot.