Answer:
246
Explanation:
Establish variables 
x = day 1 
y = day 2 
z = day 3 
... 
Given 
x+y+z = 246 
x=79 
y = z+47 
... 
Substitute x and y into the first equation and solve for z 
... 
 
 
79 + z+47 + z = 246 
Combine like terms 
2z = 246 - 79 - 47 
2z = 120 
... 
Divide both sides by 2 
highlight%28z+=+60%29people 
... 
Check cartoon%28%0D%0A79+%2B+%2860%2B47%29+%2B+60%2C%0D%0A79+%2B+107+%2B+60%2C%0D%0A246%29