Question 82544
15A+1C=268
A+C=30, A=30-C NOW SUBSTITUTE (30-C) FOR A IN THE FIRST EQUATION WE GET:
15(30-C)+C=268
450-15C+C=268
-14C=268-450
-14C=-182
C=-182/-14
C=13 NUMBER OF CHILDREN TICKETS SOLD.
A+13=30
A=30-13
A=17 NUMBER OF ADULT TICKETS SOLD.
PROOF
15*17+13*1=268
255+13=268
268=268