I’m confused and I don’t understand this can someone help?

Idon't understand what to put on the left lines i'm confused can anyone ?

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?

The excretory system,need answers for all: )