Answer:
1156
Step-by-step explanation:
When Deucalion threw one stone over his shoulder, 8 people appear. So, for every stone, we have 8 new people.
Therefore, if Deucalion threw 68 stones, the number of people that would appear is
[tex]n_1=68\cdot 8 =544[/tex]
Instead, when Phyrra threw a stone, 9 people appear. So, for every stone, we have 9 new people.
Therefore, if Phyrra threw 68 stones, the number of people that would appear is
[tex]n_2=68\cdot 9 =612[/tex]
And so, we can now calculate the total number of people that appear after each had thrown 68 stones:
[tex]n=n_1+n_2=544+612=1156[/tex]
