My last 2 sets of 5 donuts were on September 21st and November 1st. 41 days apart. I average 3 sets of balloons popped every day give or take so let's call it 40 days.
40 days X 3 sets X 3 balloons = 360 balloons. So it looks like every 360 balloons you get 5 donuts.
And I got the donuts on the same day on the same balloon pop in both my games,
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