Latest CTS Aptitude Question SOLUTION: The ratio of the no. of white balls in a bag to that of black balls is 1:2. If 9 grey balls are added the ratio of nos. of white, black and grey become 2:4:3. How many black balls

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(#M40007126) CTS Logical Reasoning question Ratio problem Keep an EYE

The ratio of the no. of white balls in a bag to that of black balls is 1:2. If 9 grey balls are added the ratio of nos. of white, black and grey become 2:4:3. How many black balls were in the bag?

a) 6 b) 9 c) 12 d) 8

Asked In CTS (12 years ago)

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sameer  (12 years ago)

ans. c) 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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vikash vicky  (9 years ago)

3 out of 9 parts are grey balls
so 3/9 p = 9
so 1/9 p = 3
black balls are 4 parts
so 4/9 = 12
so nmbr of black balls are 12

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