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How to do the second problem of this math problem, please ask for the detailed process, thank you.
1, assuming that one person infects X people on average in each round of infection, then

Total number of people suffering from influenza after the first round:1+x 0+x.

Total number of people suffering from influenza after the first round: (1+x)+(1+x) x.

So: (1+x)+( 1+x)x=64, and x=7 or x=-9 (excluding) is obtained.

2. Number of people infected in the third round =64*7=448