Age problem algebra

Question

Goldfish cost 2 and tropical fish cost 2.5 dollars. Howard bought three more gold fishes than tropical fish. How many gold fishes did he buy.

Answer 1

(x+3)*2 + x*2.5 = T where T is the TOTAL that you did not specify.

2x + 6 + 2.5x = T

4.5x + 6 = T

x = (T-6)/4.5 is the number of tropical fish he bought.

x+3 is the # of goldfish