In a claaa there are 40 boys and certain number of girls.The probability of selecting a girl at random is 3/7 . How many girls are there in the class?
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Answer:Let the no. of girls be x
40+x=3x/7
=>7(40+x)=3x
=>280+x=3x
=>280=3x-x
=>280=2x
=>280/2=x
=>140=x
Ans- x=no. of girls =140
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