Answer:
There were 7 adults and 28 children.
Step-by-step explanation:
Let the number of adults who saw a movie that day be 'a'
Let the number of children who saw a movie that day be 'c'
A matinee ticket costs $6 per adult and $1 per child. On a certain day total money collected was $70. We can represent this as :
...... (1)
On a certain day, the total number of adults and children who saw a movie was 35. This can be represented as :
.......(2)
These two equations can be used to solve this question.
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If you want to solve this, we can substitute
in (1)
=> 
=> 
a = 7
And c = 
So, there were 7 adults and 28 children.