# math

the current ratio of boys to girls at a certain school is 2 to 5 . if 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. how many boys currently attend the school?

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1. number of boys --- 2x
number of girls --- 5x

after 12 new boys
number of boys = 2x+12
girls , still 5x

(2x+12)/(5x) = 4/9
18x + 108 = 20x
108 = 2x
x = 54

So now the number of boys
= 2x+12
= 108+12
= 120

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2. Wrong!!The question is how many boys CURRENTLY attend the school. and that is 2x=108

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