Tickets and price for tickets.
Form 2 equations
X + Y = 15
15X + 8Y= 155
X= Number of adult tickets
Y = Number of children tickets
Then now
multiply first equation by 15
15•(X + Y ) = 15X + 15Y = 15•15 = 225
Then, now substract
15X + 15Y = 225
minus
15X + 8Y = 155
Result is
0 + (15-8)Y = 225 - 155 = 70
7Y = 70
Therefore
Y= 70/7= 10
Now replace Y = 10, at first equation
X + Y = 15
X + 10 = 15
X = 15 - 10 = 5
ANSWER FINAL IS
THERE ARE
15 CHILDREN and
5 ADULTS