The possible ratios are 2:1 , 4:2, 6:3 etc.
Given that there are 40 boys and 20 girls in a room.
So the ratio of boys to girls is:
[tex]40:20=2:1[/tex] [Reduced by 20]
To get similar ratios we can multiply by numbers like 2, 3 with the ratio.
[tex]2:1=4:2=6:3[/tex]
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