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In a group of boys and girls , 15 girls ...

In a group of boys and girls , 15 girls left the group , the ratio boys and girls becomes `2:1` . If after , 45 boys left the group , the ratio become `1 :5` Initially ,how many girls were there in the group ?

A

a)20

B

b)30

C

c)40

D

d)50

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