Let c and d be the number of cds and dvds respectively.
c+d=12
c=12-d
The we are told that:
2c+3d=31, using c found above in this equation gives you:
2(12-d)+3d=31
24-2d+3d=31
24+d=31
d=7
So Phillip bought 7 dvds.
check...
3*7+2(12-7)=31
21+2(5)=31
21+10=31
31=31
Answer:
Tip Total: $ 12.63
Tip Each Person: $ 6.32
Total (Bill + Tip): $ 96.83
Total Each Person: $ 48.42
Step-by-step explanation:
Is there a question here? I can't see it!