aptitude shortcuts_ averages

7/28/2019 Aptitude Shortcuts_ AVERAGES

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Friday, October 26, 2007

AVERAGES

AVERAGES

1.

Average = [ Total of observations/No.ofobservations ]

2.(i)When a person joins a group in case of increasingaverage Age weight of new comer =

[ (Previous Age + No.of persons) *Increase in Avg ]

(ii)In case of decreasing Average, Age (or) weight of

new comer =

[ (Previous Age - No.of persons) *Decrease in Avg ]

3.When a persom leaves a group and another personjoins the group in the place of person left, then

(i)In case of increasing average, Age (or) weight ofnew comer =

[ (Age of person left + No.of persons) * Increasein Avg ]

(ii)In case of decreasing Average, Age (or) weight ofnew comer =

[ (Age of person left - No.of persons) * Decrease

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in Avg ]

4.When a person leaves the group but no body joins thisgroup, then

(i)In the case of increasing Average, Age (or) weightof man left =

[ (Previous Age - No.of present persons) *Increase in Avg ]

(ii)In case of decreasing Average, Age (or) weight ofnew comer =

[ (Previous Age + No.of present persons) *

Decrease in Avg ]

5.If a person travels a distance at a speed of x Km/hrreturns to the original place of y Km/hr then average

speed is

[2.x.y/(x+y)

]

6.If half of the journey is travelled at speed of x km/hrand the next half at a speed of x km/hr. Then average

speed during the whole journey is

[2.x.y/(x+y)

]

7.If a person travels 3 equal distances at a speed of xKm/hr,

y Km/hr,z km/hr.Then average speed during wholejourney is

[ 3.x.y/(x.y+y.x+z.x) ]

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8.

A

[3.x.y/(2x*y)

]

9.A

[ 3*L/[ (L/S1)+(L/S2)+(L/S3)]

10.A

4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]

11.A

1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [(z/100)*(1/S3) ]

Posted by smallboy at 12:13 AM

4 comments:

RAJA said...8.

A

[ 3.x.y/(2x*y) ]

9.A

[ 3*L/[ (L/S1)+(L/S2)+(L/S3) ]

10.A


4/4

4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]

11.A

1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [ (z/100)*

(1/S3) ]

kindly write the questions for the following as i am

unable to under stand them

November 25, 2010 at 5:06 PM

sandy said...

please give a brief description for formulae ..so that we

can fetch more easily

October 26, 2011 at 4:30 AM

sandy said...

8.

A

[ 3.x.y/(2x*y) ]

9.A

[ 3*L/[ (L/S1)+(L/S2)+(L/S3) ]

10.A

4L/[ (L.S1)+(L/S2)+L/S3)+(L/S4) ]

11.A

1/[ (x/100) * (1/S1) ] + [y/100) * (1/S2) ] + [ (z/100)*

(1/S3) ]

please give a clear idea for these formulaeOctober 26, 2011 at 4:47 AM

vivek said...

i think your 2nd formulae doesnt work

exmp

consider a classroom of 39 stu's of 15 yrs of age and if

teacher weight is included avg is increased by 3 months

find age of teacher

November 2, 2012 a t 5:54 AM

aptitude shortcuts_ averages

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