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musickatia [10]
3 years ago
6

1

Mathematics
1 answer:
s2008m [1.1K]3 years ago
3 0
84 blue marbles.
Steps:
1) Use the 3:7 ratio
2) Since there are 36 red marbles, you should know to multiply the ratio by 12.
3) Multiply 7 by 12 (7x12=84)
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4 years ago
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Have a nice day!

Hope this helped.

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