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I need to know this answer so I can get the answer

I need to know this answer so I can get the answer
asked 6.0k views
4 votes
I need to know this answer so I can get the answer

I need to know this answer so I can get the answer-example-1
asked
User Tim Johnsen
by
8.1k points

2 Answers

4 votes
58 cds and and 34 dvds
answered
User Mark Szabo
by
7.7k points
1 vote
CD=50 DVD=40
5C+7D=530

C=D+10
C-D=10
Solve the system
5C+7D=530
5C-5D=50 (multiply by 5)
Subtract
12D=480
D=40
Substitute in any of the equations
C-D=10
C-40=10
C=50
answered
User Rohin
by
8.2k points
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