Respuesta :

He will catch 80 insects in night 5.

In night one he catches 5.
Night 2 is doubled so it will be 10.
Night 3 is 20
Night 4 is 40
(40x2)
And night 5 is 80.

Night 1 = 5

Night 2 = 10

Night 3 = 20

Night 4 = 40

Night 5 = 80

On the 5th night, the bat catches 80 insects.