Question

A bag contains 15 balls, 5 blue and rest red. By adding some blue balls, probability of drawing blue balls becomes 3/2 times that of red ball.Find number of blue balls added..?

Answer 1

let x be the ball added .

According to the question , we get

5/15+x=3/2(10/15+x)

After crossing we get ,

150+10x=450+30x

20x=-300

x=-300/20=-15

hence if we add -15 , we can satisfy the question.

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