math
posted by murder .
Admission
to
a
movie
is
$11
for
adults
and
$8
for
children.
If
the
receipts
for
200
tickets
were
$1780,
how
many
adult
tickets
and
how
many
childrenâ€™s
tickets
were
sold?

If x adult tickets were sold, then 200x child tickets were sold. So, add up the cost of each:
11x+8(200x) = 1780
x = 60
so, 60 adult and 140 child tickets were sold.