A pet store has 80 geckos and ankle lizards altogether. The ratio of geckos to allow lizards is 3:5. How many geckos does the pet store have?
The total ratio representing the number of geckos and ankle lizards at the pet store is 3+5=<<3+5=8>>8
If the total ratio is representing 80, then 1 unit of the ratio is equal to 80/8=<<80/8=10>>10
The number of geckos at the pet store is 3*10 = <<3*10=30>>30. Answer: \boxed{30}.