The admission fee for a charity event is $7 for children and $10 for adults. the event was attended by 700 people, and the total amount collected in admissions was $6,400.

I’m not sure what your question is but I’m guessing you want me to solve the equation so I’ll do that:

c-children
a-adults
700= c+a
6400=7c+10a

Do elimination

So
-7(700=c+a)
6400=7c+10a

-4900=-7c-7a
6400= 7c+10a

C cancels out
1500=3a
a=500 people
700=c+500
200=c

So there were 200 children and 500 adults

Bruh sound effect #2