TRICKS TO SOLVE QUESTIONS OF "AVERAGE" -DHIRAJ SINGH CHAUHAN

ABOUT ME B.Sc.(Hons.) from BHU Varansi Income tax Inspector, 27th Rank in CGL 2015 . Tier 1-150/200 Tier 2-347/400 Interview-60/100 . Cracked CPO,CHSL,CDS,AFCAT, IB-ACIO etc Course Fee- Contribute . Follow me on at: https://unacademy.in/user/dhirajaryal

Using Mixture and Alligation Q-14-A bowler had an average of 24.85 runs per wicket. In last match, he took 5 wickets for 52 runs and his average decreased by 0.85. Find total number of wickets taken till last match.

24 85 5 2 2 3.6 Ratio 80 O 85 5

Hard Nuts- CGL 2015 Tier 1 Q-15-A librarian purchased 50 story books for his library. But he saw that he would get 14 more books by spending rupees 76 more and Average price per book would be reduced by rupee 1. Find average price of each book he bought.(in rupees) (i)15 (ii)10 (iii)25 . (iv)20

750+76= 8 26 826 64 56, + 76 = S76 576

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Dhiraj Singh Chauhan

Income-tax Inspector, Cleared Assistant Commandant(SSB), From Saharanpur

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Jyoti chib

a year ago

sir topic kha pr h jo aapne

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Bhaskarjyoti Hazarika

3 years ago

Q 15 Solution :
50*x + 76 = 64(x -1)
x = 10.
This method is much more easier than checking each options.

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Riyas ki

3 years ago

yes. this one is the easiest method than trying out each option

Maisnam Suraj Singha

2 years ago

Bhaskarjyoti, can u elaborate me the formula u stated above

Ajay Tiwari

2 years ago

@maisnam nhi krega elaborate ????

Shailesh dimri

3 months ago

bt Bhai vo 64kidar see ayga (x-1)ke samny

Prateek Upmanyu

3 years ago

Question no. 15 CGL-2015:
Let the average price of 50 books be x rupees,
so the total price of 50 books = 50x
Now, since there is a decrease of rupees 1 in average price the average of 64 books will be (x-1)
so the total price of 64 books is 64(x-1)
now the extra amount he paid is the difference between the two total prices i.e.76
so 64(x-1)-50x=76.
so x=10 (answer)

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Raju Kumar

2 years ago

Excellent

Bhavana Royal

3 years ago

Hi Dhiraj..
Could you check this question , i wasn't getting the answer when i tried to solve it by the method you used for Q14.
Q) The bowling average of a cricketer was 12.4. He improves his bowling average by 0.2points when he takes 5 wickets for 26 runs in his last match . The number of wickets taken by him before the last match was ?
and one more question is , if the average bowling speed improves means , should we subtract or add that 0.2 to 12.4 ?

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Vipin Deswal

3 years ago

175 wickets + 5 wickets in last match = 180 wickets in total

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Albin Samuel

2 years ago

You will have to subtract 0.2 from 12.4 because here improvement means reduction in runs per wicket

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Aniruddha Chakraborty

8 months ago

185 -5 as asking (wickets taken by him before the last match )..equal to 180

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Somnath

3 years ago

in the last question if we go through the method than it will be ......
let total price of 50 book is X
than total price of 50 book is 50X
than 50+14=64 book price is 50X+76 and its avg is (50x+76)/64
now the avg is reduce to 1 ; means total avg of 64 book is (X-1)
means (50X+76/64)=X-1 solve it and u get X=10
THANKS DHIRAJ SIR

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SONU YADAV

3 years ago

thank you so much really you are doing great job ..

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