Yellow tangs

In an aquarium, 2/5 of the fish are surgeonfish.  Of these, 3/4 are yellow tangs.  What fraction of all fish in the aquarium are yellow tangs?

Correct answer:

x =  3/10

Step-by-step explanation:

$x=\frac{2}{5}\cdot \frac{3}{4}=\frac{2\cdot 3}{5\cdot 4}=\frac{6}{20}=\frac{3}{10}=0.3$

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