Answer:
1 : 2
Step-by-step explanation:
given that [tex]\frac{2}{3}[/tex] of the class are girls , then
[tex]\frac{1}{3}[/tex] of the class are boys
the ratio of boys : girls = [tex]\frac{1}{3}[/tex] : [tex]\frac{2}{3}[/tex] ( multiply both parts by 3 )
ratio of boys : girls = 1 : 2
