Shelves 7633

Juraj had music CDs and DVDs stored on the shelves. There are a total of 64. How many DVDs are on the shelf if there are seven times less than a CD?

Correct answer:

d =  8

Step-by-step explanation:

d = c/7

c+d = 64
c-7d = 0

Row 2 - Row 1 → Row 2
c+d = 64
-8d = -64

d = -64/-8 = 8
c = 64-d = 64-8 = 56

c = 56
d = 8

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