Question

Celia bought a bag of 12 goldfish for $3. What is the cost of 1 goldfish?

Answer 1

we know that

Celia bought a bag of $12$ goldfish for $\ 3$

so

by proportion

Find the cost of $1$ goldfish

$\frac{3}{12} \frac{\ }{goldfish} =\frac{x}{1} \frac{\ }{goldfish} \\ \\x=3/12 \\ \\x=\ 0.25$

therefore

the answer is

The cost of one goldfish is $\ 0.25$