Latest Wipro Aptitude Question SOLUTION: The average of six numbers is 30.If the average of first four is 25 and that of last three is 35, the fourth number is : A) 25 B) 30 C)35 D)40

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The average of six numbers is 30.If the average of first four is 25 and that of last three is 35, the fourth number is :
A) 25 B) 30 C)35 D)40

Asked In Wipro (12 years ago)

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Read Solution (5) :

balaji  (10 years ago)

a+b+c+d+e+f=180
a+b+c+d=100
d+e+f=105
add 2nd and 3rd equations
a+b+c+2d+e+f=205
solve to find d as 25

Is this solution Helpfull? Yes (8) | No (4)  

Deepak Dixit  (8 years ago)

Sum of all six no. is 180(30*6)
sum of first four 100
sum of last three 105
forth no. is 100+105-180=25

Is this solution Helpfull? Yes (4) | No   

CHAMUNDESWARI  (8 years ago)

a+b+c+d+e+f=180
a+b+c+d=100
d+e+f=105
from 1 and 3
we get... a+b+c=180-105=75
from 2 we get... d=105-75=30

Is this solution Helpfull? Yes (2) | No (2)  

praveendas  (8 years ago)

sum of six nos is 180.
sum of first four is 100
sum of last three is 105.
sum of last two is 180-100=80.
fouth one is obtained by 105-80=25.

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  (5 years ago)

let x1,x2,x3,x4,x5,x6 are the the six no
then
x1+x2+x3+x4+x5+x6/6 =30
then x1+x2+x3+x4+x5+x6=180 ----eq1
According to the question, average of first four i.e x1,x2,x3,x4 is 25
x1+x2+x3+x4/4 =25
then x1+x2+x3+x4=100

then by eq1 100+x5+x6=180
x5+x6=80 -----eq2
and x4+x5+x6=105(35*3)
putting the value of x5+x56 from eq2
80+x4=105
x4=25

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