Respuesta :

Let t represent a number of lemon tetras allowed per gallon.

20t
musiclover10045

 I gallon of water per 1 inch of fish

 lemon tetra is 2 inches long

 so 1 lemon tetra for 2 gallons of water

20/2 = 10

 they can have 10 of them

 equation would be X = 20/2

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