Answer:
15
Explanation:
Supposing:
Coloured marbles = x
Glass marbles = y
According to Question
x = 3y
As,
x + y = 60
3y + y = 60 (putting value of x = 3y)
4y = 60
y = 60/4
y = 15
Hence, Leo has 15 Clear-glass marbles
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