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Answer:

15

Step-by-step explanation:

If the colored marbles are three times as many as the see-through marbles, and the number of see-through marbles added to the number of colored marbles is 60, then there are 15 see-through marbles. 3 multiplied by 15 is 45, and 45 added to 15 is 60. I hope you found this helpful!

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