Ratio is boys to girls.
[tex]\frac{girls}{boys}[/tex]
18 boys and 6 girls
[tex]\frac{6}{18} = \frac{1}{3}[/tex]
Convert the fraction to a decimal
[tex]\frac{1}{3} = 0.333333[/tex]
Answer
Fraction form: [tex]\frac{1}{3}[/tex]
Repeating decimal: [tex]0.333333[/tex]