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the ratio of white balls to black balls is 1:2. if 9 balls 
are added then the ratio of the balls become 2:4:3. find 
the number of black balls. a) 12 b) 6 c)9 d)none
 Question Submitted By :: General-Aptitude
I also faced this Question!!     Answer Posted By  
# 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.
Is This Answer Correct ?    15 Yes 2 No
# 2
how can grey balls come from nywhere? the ratio is only
given for two types of balls, then how come there is
another color of balls added?
Is This Answer Correct ?    4 Yes 1 No
# 3
Wrong Question 
Is This Answer Correct ?    3 Yes 2 No
# 4

taken 2 white ball na next to take 4 black balls next 3 white balls going on
Is This Answer Correct ?    0 Yes 0 No
# 5
the data is not correct 
Is This Answer Correct ?    3 Yes 4 No
# 6
please correct your Question! 
Is This Answer Correct ?    0 Yes 1 No
Venkat Stony
# 7
Is This Answer Correct ?    1 Yes 3 No

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