| Some basic Number Average Aptitude Questions with Answer Part1
Below are the some good Number Average Aptitude Questions with answers
(1)Average Aptitude Questions
(a)What is the average of first five multiples of 35?
(i)70
(ii)105
(iii)140
(iv)100
(b)If average of three consecutive even numbers is 34 so find
the largest of these numbers
(i)40
(ii)32
(iii)34
(iv)36
(c)If average group of 30 boys is 16 years and one boy with
age 19 leaves the group and a new one joined and average is
15.8 years now. Find the age of new boy.
(i)12 years
(ii)13 years
(iii)14 years
(iv)15 years
(d)What is the average of first five natural numbers?
(i)5
(ii)2
(iii)3
(iv)4
(e)If the average of 20 numbers is zero, how many numbers may be greater than zero?
(i)19
(ii)49
(iii)17
(iv)33
Answer:-
1(a)
Average=35*(1+2+3+4+5)*1/5
Average=35*15*1/5
Average=35*3=105
1(b)
Let First number is x so next two number are x+2,x+4
so total is =(x+x+2+x+4)/3=34
(3x+6)/3=34
3x+6=102
3x=96
x=32
so largest number is 32+4=36
1(c)
Let age of new boy is x years
Total age of 30 boys =30*16=480 years
Now average with new age=(30*16-19+x)/30=15.8
480-19+x=474
x=474-480+19=-6+19
x=13 years
1(d)
average=sum of items/number of items
average=1+2+3+4+5=15/5=3
1(e)
Let avarage of 20 number is 0
and sum of 20 number=(0*20)=0
so it is quite possible that 19 of these numbers may be positive and if sum is "x" then 20th number will be (-x) so answer is (i)19 | | |