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The ratio of boys to girls in a class is 5 : 6. If there are 20 boys, how many girls are there?
this symbol (:) is equivalent to a division sign. We can set up an equation; 5/6=20/x. For this specific problem, we can see that you can multiply 4 to reach 20. Then you can multiply 6 also by 4 and get 24. Generally, you should cross multiply. 5x=120; x=24. The final answer is 24 girls.
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