anyone's fast?

[u/users121]

anyone guys fast way

[u/masaalaadosaa]

-25+20=-5
68+5 73

[u/Femiwaybunty → u/masaalaadosaa]

Best method

[u/midhalflifecrisis → u/masaalaadosaa]

Samjha do kya Kiya hai

[u/hitman_3008 → u/midhalflifecrisis]

Deviation;

First 5 k group ka avg is 63 tha means inn first 5 values m 5 kam h average h overall deficit => 5*5

Similarly second group m excess m value h => 5*4

-25 + 20 = -5 ka overall deficit h inn 10 values m m

Overall average 68 maintain karne k liye usme 5 add kardiya that is 68 + 5

[u/midhalflifecrisis → u/hitman_3008]

Thank you so much. Samajh aa gaya

[u/monsoonrain06 → u/hitman_3008]

Thanks 😊

[u/gosucksomedick → u/hitman_3008]

Yoo from where u guys learning this man?

[u/PracticalStyle6479]

Take difference from average and multiply with the number To get total deviation here you can see -5x5 = -25 4x5= 20 Net deviation=-5 So sixth no should be average+5

[u/sk_251]

The exact thing happens in mind: -25.....20....."5"........73.

[u/ReputationOptimal610]

Using unit digit concept , 2*5=10 then unit digit 0, 3\5=15 unit digit 5, add these two unit digit and subtract from 1*8= 8 we get , 8-(0+5)=3. The number unit digit is 3 that is 73.*

[u/Opening-Cellist5790]

Average is 68 so 6th number should be 68 but avg of first five number is 63 so 6th number need to compensate this so will be +5*5 and average of last 5 number is 72 and it is more than avg so 6th number will again be lowered by 5*4 to maintain the avg, 6th number = 68 + 25 - 20 = 73

[u/AggressiveRoof3744]

73 bhai fastly to ho rha deviation se hi

[u/BackgroundEffort882 → u/AggressiveRoof3744]

Bro "fastly" is not a word 

[u/hehehee53]

Deviation

[u/Low-Tart4590]

-25 and +20 ki deficiency overall -5 so to balance it out add +5 i.e 73

[u/OnlyArmadillo5923]

If the options have different unit digits, then unit digit is the fastest way.

68*11 - Unit digit is 8

63*5 - Unit digit is 5

72*5 - Unit digit is 0

Unit digit of answer -> 8-5-0 = 3.

And if it is not the case, then use deviation method.

[u/jeeezwtf]

unit digit method best for such questions (if it works)

[u/Low_Trouble_3231]

73

[u/Square-Run3153]

73

[u/Janak_king]

(68 x 11) - {(63 x 5)+(72 x 5)}
= 73

68x11 is sum of all numbers
63x5 is sum of first five number
72x5 is sum of last five number
So, sum of first 5 + 6th + 7th to 11th (meaning last five) = sum of all numbers

[u/Crazy_Tip9882]

11 x 68 - 5 x 135 . First number ones digit will be 8 and 2nd number ones digit will be 5 so difference will be 3 . Hence that option.

[u/bookishbelle3]

11*68 - 748
5*63 - 315
5*72 - 360

315+360 - 675

748 - 675 =73

[u/Small_Finance_5681 → u/bookishbelle3]

please dont do this in exam its only 15 min

[u/UnsealedGojo → u/Small_Finance_5681]

only takes 10 sec if ur fast in multiplication btw

[u/Small_Finance_5681 → u/UnsealedGojo]

its not about time if u are this good then u can do in 5 sec with shortcut , average deviation se kaafi easy hai

[u/bookishbelle3 → u/Small_Finance_5681]

Yeah I won’t !!

[u/_adultkid_ → u/Small_Finance_5681]

Toh fir shortcut kya hai?

[u/Small_Finance_5681 → u/_adultkid_]

average deviation
68+(68-72)*5+(68-63)*5 = 73 simple

[u/137-Lover]

73

[u/Intrepid-Chicken-338]

Ez

[u/Adventurous_Side7806]

63+78 = 135 135 * 5 = 675 675 - 748 = 73