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Elis [28]
3 years ago
10

Alex has some marbles.

Mathematics
1 answer:
vitfil [10]3 years ago
6 0

Answer:

11 marbles

Step-by-step explanation:

Let x = no. of marbles-Alex

3x = no. of marbles-Billie

3x - 9 = no. of marbles-Chris

x + 3x + 3x - 9 = 68

7x - 9 = 68

7x = 77

x = 11

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4 years ago
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