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33-7r = 3(6-4r)
33 - 7r = 18 - 12r
33 -7r + 7r = 18 - 12r + 7r
33 = 18 - 5r
33 - 18 = 18 - 5r - 18
15/5 = 5r/5
3 = r
r = 3
Answer:
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Answer 76
Step-by-step explanation:
Answer:
16
Step-by-step explanation:
the 9 parts of the ratio is equivalent to 72 books
divide number of books by 9 to find one part of the ratio
= 8 ← 1 part of the ratio
2 parts = 2 × 8 = 16 ← number of bookmarks sold