Mr. Johnson purchased 20 concert tickets for a total of $225. The concert tickets cost $15 for adults and $10 for children under twelve. How many tickets for children under twelve did Mr. Johnson purchase?
15a +10c=$225 a + c = 20 Rewrite the second equation so it has a value for c c= 20 -a Now using substitution method replace the c for the given value 15a + 10(20-a)=225 15a +200-10a=225 Combine like terms 5a +200=225 5a=25 a=5 So 5 adult tickets were bought and 15 children tickets
