The total amount of children that went on both days is 7 + 4 = <<7+4=11>>11.
The cost of the children's tickets is 11 × $3 = $<<11*3=33>>33.
The total amount of adults that went on both days is 5 + 2 = <<5+2=7>>7.
The cost of the adults' tickets is 7 × $4 = $<<7*4=28>>28.
The zoo made $33 + $28 = $<<33+28=61>>61 in total.
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