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Maths, Addmaths and Statistics: Post your doubts here!

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The ratio of boys to girls in a school is 3 : 4 .
There are 120 more girls than boys.
How many students are in the school?
 
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a = 3 b= -1
-4 7

what would b !a! ????
" !! " denotes the sign for length of a
plz reply
 
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