I'd say that a 12 ounce feeder can feed about 40 hummingbirds
The two number would be 3.5 and 8.5
20% of 50 is 10
Half of 50 is 25
25 + 10 = 35
50 -35 = 15
15 of the backpacks were neither pink or blue
Hope this helps :)
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