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