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

Lets Delve deeper Q.3- Average weight of 4 men is increased by 3 kg when one of them who weighs 120 kg is replaced by another man. Find the age of that new person. Sol.- 120 + 4x3 = 132 kg

New perspective Q,4-A batsman scored 87 runs in 17th innings and therefore, his run-rate increased by 3 runs per match. Find his new run-rate. Sol- 17 3=51 is distributed over all innings. Remaining 87-51 = 36 was his old run rate. And new run rate = 36+3 = 39

.Q.5- average age of a family of 6 members is 22. If age of younger member is 7 years. Then what was the average age of family at birth of youngest member Sol- 7 years ago, Average age of family-22-7-15 years But number of members= 6-1 = 5 So Average age = 15 + 15/5 = 18 years

7 lessons,

1h 2m

Enroll

2.3k

✕Download

Dhiraj Singh Chauhan

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

U

Unacademy user

Abhinav Pandey

a year ago

did clue originate from
something like 'couple+glue'...
just a guess from the hint.

0

Reply

Tipach Annu

2 years ago

Q4. If the avarage is equally
distributed, in his 17th innings also he will get 3 runs extra, ie. 87+3=90.
Now the amount which is equally distributed is 17*3=51
His new run rate then would be 90-51=39.
Just another way... More satisfying for me... :)

9

Reply

Tipach Annu

2 years ago

Q4. If the avarage is equally
distributed, in his 17th innings also he will get 3 runs extra, ie. 87+3=90.
Now the amount which is equally distributed is 17*3=51
His new run rate then would be 90-51=39.
Just another way... More satisfying for me... :)

3

Reply

Riyas ki

3 years ago

I didn't understand 5th questions last step. how 15/5 came?
before birth of youngest member, AVG= 22-7= 15 (n=6)
but no of members were originally 5 only.
at the birth of youngest member, n=6
then their average may reduce na?

2

Reply

Anoop C

2 years ago

sir, avg of 6 at present=22
avg of 6 seven yrs back=22-7=15
total age of 6 seven yrs back=15*6
but 7yrs back only 5 members
then avg=(15*6)/5=18

Rahul Gosam

2 years ago

avg means it distributes to all R8..
then the 15 yrs of that youngest one (who is not born 7 yrs ago ) shouldn't be counted that implies this 15 yrs distributes to 5 mem of family that's where 15+15/5 comes.. hope u understood..

Amitsharma Sharma

2 years ago

nice sir your lessons are owsome please upload entire ssc sallybus video because ur teaching way is mind blowling

0

Reply

Akhil Yadav

2 years ago

sir ur trics are excellent but taught the lessons in English also.tq

1

Reply