First find how many birds get scared away by kids: 36 seagulls / 4 = <<36/4=9>>9 seagulls
Then subtract that number from the starting total: 36 seagulls - 9 seagulls = <<36-9=27>>27 seagulls
Then divide that number by 3: 27 seagulls / 3 = <<27/3=9>>9 seagulls
Then subtract that number from the 27 seagulls to find the final number of seagulls: 27 seagulls - 9 seagulls = <<27-9=18>>18 seagulls
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