Andrew M. answered 10/24/16
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
C = tickets sold with card
N = tickets sold with no card
15C + 20N = 5345 total money made is 5345
C + N = 320 total tickets sold is 320
From 2nd equation C = 320-N
Substitute that into first equation to solve for N
15(320-N) + 20N = 5345
4800-15N+20N = 5345
5N + 4800 = 5345
5N = 5345-4800
5N = 545
N = 545/5
N = 109 tickets sold without ASB card
C = 320-N = 211 tickets sold with ASB card
Check answer:
15C+20N=5345
15(211)+20(109)=5345
3165+2180 = 5345
5345 = 5345
Answer is correct