Balls

A sporting goods store ordered an equal number of white and yellow balls.The tennis ball company delivered 45 extra white balls,making the ratio of white balls to yellow balls 1/5 :1/6
how many white balls did the store originally order for?
a)450 b)270 c)225 d)none of these
This question is related to TCS Interview

Questions by chandradeepika   answers by chandradeepika

Showing Answers 1 - 21 of 21 Answers

SpandanaMohan

  • May 29th, 2008
 

 option : c is the answer

Let the initial number of white and yellow balls be 'x'...Tennis ball company delivered 45 extra white balls..therefore the number of white balls is x+45...and the new ratio of white balls and yellow balls is 1/5:1/6..remiving the rational form...we get 6:5 and this is equal to x+45:x ratio...
       
                     x+45             6
                     -------   =      ---   => 5x+225=6x => x=225
                        x                5  
Therefore store originally order for 225 balls

mehulgogri

  • Jun 20th, 2008
 

According to me the Answer is 270....
x-white balls    y=-yellow balls

x=y

x+45/5 = y/6

solve above 2 eqs

x=-270    balls cannot be negative....

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SURAJTHEGREAT

  • Mar 2nd, 2009
 

According to me answer is 225, bcoz, the given ratio is 0.2:0.1666, Simplifying we get 1.2:1 (that is there is 1 yellow ball for 1.2 white ball) By trial and error method, by substituting the given choices,225 is "THE" most
appropriate. However it took 3-4 min to solve. Friends come with an alternative method, which consumes less time.


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mus.shah

  • Nov 2nd, 2009
 

(1/5-1/6)*x=45
after solving
x=1350;
No of yellow balls =(1/6)*x=225
i.e No of white balls =(1/5)*x=270
and the diff is =270-225=45
so answer is =270 white balls

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milindnsec

  • Dec 30th, 2009
 

Let there is x no of each ball, when 45 white ball is added total number of white ball = x+45 now accordingly
               x+45x=65
               x=225
so total no of white ball is 225+45=270
    

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anilkumar_cse

  • Apr 1st, 2010
 

Given ratio is of white and yellow balls and it is 1/5:1/6.


=> 6:5
=> Therefore the total balls are in 11 parts.
=> so the total balls delivered must be divided by 11.
=> From the answers 450 + 45 is divided by 11, so the answer is a=>450

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