The ratio of white balls and black balls is 1:2. If 9 gray balls is added it becomes 2:4:3. Then what is number of black balls.

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1. these are question tht are seem to be like it consumes
   time. so dont see jus the question and run to the next .

   ans. a) 12

   if 9 balls are added then the ratio to the combination
   becomes 2:4:3.

   9 balls make the ratio 3 for grey balls in tht mixture.
   so the factor is 9/3 = 3 (in tht mixture)

   so the same factor has to be maintained through out the
   ratio. so black balls is 4 * 3 = 12 and white balls is 2 *
   3 = 6.

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