There were 60 guests / 2 = <<60/2=30>>30 women at my mother's birthday celebration.
There were 30 women + 15 men = <<30+15=45>>45 men and women.
So, 60 people - 45 men and women = <<60-45=15>>15 were children.
Then, 15 men / 3 = <<15/3=5>>5 men left.
Thus, 5 men + 5 children = 10 people left.
Therefore, 60 people - 10 people = <<60-10=50>>50 people stayed and enjoyed the birthday celebration.
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