we know that
Celia bought a bag of [tex]12[/tex] goldfish for [tex]\$3[/tex]
so
by proportion
Find the cost of [tex]1[/tex] goldfish
[tex]\frac{3}{12} \frac{\$}{goldfish} =\frac{x}{1} \frac{\$}{goldfish} \\ \\x=3/12 \\ \\x=\$0.25[/tex]
therefore
the answer is
The cost of one goldfish is [tex]\$0.25[/tex]
Celia will pay 0.25 dollars for 1 goldfish. The cost of 1 goldfish is $ 0.25
The Total number of goldfish purchased is 12.
Cost price for 12 goldfish is $ 3.
Let the price of 1 goldfish be x dollars.
Therefore,
[tex]\begin{aligned}x \times\$12&=\$3\\x&=\dfrac{3}{12}\\x&=0.25\end{aligned}[/tex]
Hence, the cost of 1 goldfish is 0.25 dollars.
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