Tricky Methods for solve Average Related Questions

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Last article related to How solve Age Related problems, Now we find how solve Average Questions Quickly ……

We know that …
               Sum of Quantities
Average =—————————
                Number of Quantities

Consecutive Numbers =x,x+1,x+2,X+3……..

ODD/EVEN Consecutive no.are-
=x,X+2,x+4,x+6,x+8……

Q. If five consecutive no.average is 28 then find highest no.this series.

Solution :
      Number of this series –5
      Average of this series –28

                      5/2=2.5
It means series middle no …28
                           |
                26,27,28,29,30
So highest no. is- 30(‘-‘)

Q2. If average of 8 ODD consecutive no. is 18 then find least no of this series.

Solution –
                     No.-8
           Average -18
Series. Odd-

So no. Before/ after middle -8/2
                          = 4(even)

                           18(average)
       11,13,15,17  | 19,21,23,25

So here least no is-11(‘-‘)

Q.3 The average of 30 Students in a class is 10years.If the Class teachers age be included, the average age become 11 years. Find the age of Class teachers.

Solution:

Total age of 30 Students =30×10
                                        =300
Total age 30student+1Teacher
                                        =31×11
                                        =341

So Age of only teacher =341-300
                                       =41(‘-‘)

Q4 The average of 6 numbers is 8.What is 7th number so that average become 10.

Solution :

7th no is=Total of 7 no.—Total.                of 6 no.
                = 7*10-6*8
                 =70—48
                 =22(‘-‘)