Thursday 28 February 2013

RATIO




Gone are the days when the “slow and the stea­dy” used to win the race, now it’s just the “fast and the furious” who snatches the cream and especially in the case of BANK, you aren’t supposed be just ‘fast and furious’ but more importantly accurate!

SO here i am back with another trick on ratio ...
after reading this post you can solve problems without using you pen or pencil....

so lets start with an example........

question . the present ratio between preeti and asha age is 9:13 respectively. 8 years ago the ratio was 7:11 respectively. 

1.what is preeti present age?
2. preeti age 8 years ago?
3. difference in their ages?
4. asha present age?
5. asha age 8 years ago?

every bank aspirant can solve this question but how many can solve it in 10 seconds?
you can after reading and applying this trick..

lets get to question..
after writing the ratio in this form look for first vertical and then horizontal difference

                                     initial ratio =  9:13
                                      final ratio  =  7:11  ( 8years ago)




if the vertical difference between two ratio are equal , we will take the difference of vertical ratio.
difference of vertical ratio = 2
now this change of 2 comes because of 8 yrs (given in question)

                therefore 2( ratio) = 8
                            so 1 (ratio) = 4

NOW LETS GIVE THE ANSWERS..
1.what is preeti present age?
                       present age ratio of preeti = 9 (given in question) 
                      so 9 X 4 = 36 years

2. preeti age 8 years ago? 
preeti age ratio after 8 years is 7 so 7 X 4 = 28 years

3. difference in their ages? 
difference in ratio of ages is 4 so 4 X 4 = 16 years..

REST TRY YOURSELF.....

 now second case when vertical difference is not same...

eg. the ratio between preeti and asha age is 9:13 respectively. after 10 years the ratio becomes 8:11 respectively.

now      initial ratio  =  9:13
              final ratio  =  8:11
 clearly the difference between vertical ratio is not common ( 9-8=1 but 13-11=2)

therefore first we have make them equal...
to do so take the difference between horizontal initial ratio i.e 4 and multiply it to final ratio...
similarly take the difference from final ratio i.e 3 and multiply it to the initial ratio...
now the new ratio becomes      
                                               initial ratio = 27 : 39
                                               final ratio   = 32 : 44
NOTE-  ONCE you have made this new ratio forget every thing about the previous one... now you have to deal with this new ratio to solve your question.....

now you solve it just like above........

NOTE- for clearing the quant section your grip on ratio, percentage and the ultimate trick should be very good.......

ALL MATHS TRICK CLICK HERE

INTERVIEW PREPARATION CLICK HERE











 

13 comments:

  1. where else we can use this trick?

    ReplyDelete
  2. Six years ago, the ratio of the ages of Kunal and Sagar was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sagar's age at present?how to solve this using this method?

    ReplyDelete
  3. its very simple..
    vertical difference is same = 5
    therefore 5= 10 (6years ago+ 4 years after)
    1=2
    now sagar age in first case is 5 x2 = 10...
    after 6 six yeras i.e present it will be 16 and after 4 years it is 20

    ReplyDelete
  4. IF 6=10 na,then 1=1.66 ah..pls clear my doubt.

    ReplyDelete
  5. Hi dodo,

    Pls tell me how to solve this problem.

    A certain amount was to be distributed among A, B and C in the ratio 2:3:4 respectively, but was erroneously distributed in the ratio 7:2:5 respectively. As a result of this, B got Rs.40 less. What is the amount?

    Choice
    a. Rs.210 b.Rs.270 c.Rs.230 d.Rs.280 e.None of these

    Thanks

    ReplyDelete
  6. Hello sir,
    Is there any tricks to find the rate of interest in the compound interest

    ReplyDelete
    Replies
    1. the same trick can be used....
      by equating the RHS and LHS...
      CI= P X rate by trick/100
      u can rewrite this as
      CI/P = rate by trick/100

      Delete
    2. Hi dodo ,

      Thanks for the concern you are showing towards working professionals.....I would like to see a post on Compound Interest if possible....it is taking time to calculate in the normal method....share some tricks with clear explaination if possible

      Delete
    3. its already there.................
      http://hydradodo.blogspot.in/2013/02/compounf-interest-in-20-seconds.html

      Delete
  7. Hello sir,
    Is there any tricks to solve 61 to the power 25 for the
    last three digit

    ReplyDelete
  8. @ ganga : Ans for u r question is 210 ....correct me if I m wrong .....

    ReplyDelete
  9. therefore 2( ratio) = 8
    so 1 (ratio) = 4 what we take in second question. please explain and why we take explain.

    ReplyDelete