Problema Solution
The St. Mark’s Community Barbecue
served 250 dinners. A child’s plate cost $3.50 and
an adult’s plate cost $7.00. A total of $1347.50 was
collected. How many of each type of plate
was served?
Answer provided by our tutors
c+a = 250
3.5c + 7a = 1347.5
c = 250-a
3.5(250-a) + 7a = 1347.5
875 - 3.5a + 7a = 1347.5
875 + 3.5a = 1347.5
3.5a = 472.5
a = 135
c = 250-a = 250-135 = 115
therefore 115 children's plates were solve and 135 adult's plates were served