To divide $3$ by $20$, you simply perform the division:

$3 \div 20 = 0.15$

So, $3$ divided by $20$ equals $0.15$.

Would you like more details on the division process or have any questions?

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Here are some related questions to explore further:

1. What is the decimal representation of other fractions like $1 \div 4$ or $7 \div 10$?
2. How can we convert fractions to percentages?
3. What is the process for dividing a smaller number by a larger number?
4. How can we represent $3/20$ as a fraction and then as a decimal?
5. How does dividing by 20 compare to dividing by other multiples of 10, such as 10, 50, or 100?

Tip: Remember, dividing by 20 is the same as multiplying by $0.05$ because $1 \div 20 = 0.05$.