Answer :

1/5 of 15=1/5 ×15=3
whenever there is of it means u need 2 multiply first no. with second no.
[tex] \frac{1}{5}\cdot15= \frac{1}{5}\cdot \frac{15}{1}= \frac{1}{5}\cdot \frac{3\cdot5}{1}=3[/tex]

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