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250

Here's how:

1. Add the ratio: 7 + 5 = 12

2. Divide the total no. of marbles (600) by 12 = 50

3. The total no. of reds = 7 x 50 = 350

4. The total no. of blues = 5 x 50 = 250

(Total blues & reds = 350 + 250 = 600)

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14y ago
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Q: If the ratio of red to blue marbles in a bag of 600 marbles was 7 to 5 how many marbles were blue?
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