Answer: 60 stickers
Explanation:
Let's say Siti is s and Xinyi is x.
3(s - 55) = x - 15
And since s = x, we can just say that 3s - 165 = s - 15
2s = 150
s = 75
So, now Xinyi has 75 - 15 = 60 stickers.
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