Question 1199536
This is a very routine exercise.


y adults
35-y students


Account for the ticket sales revenue.
{{{7y+5(35-y)=160}}}


{{{7y+5*35-5y=160}}}
{{{2y=160-5*35}}}
{{{y=(160-5*35)/2}}}

{{{y=-7.5}}}, which is nonsense.
Something is wrong in the problem description.