Wipro Company Numerical Ability Averages

Out of four numbers, the average of first three is 16 and that of the last three is 15. If the last number is 18, the first number is :

a. 20
b. 21
c. 23
d. 25

Read Solution (Total 1)

Le the four nos be a,b,c & d
We know,
a+b+c/3=16
b+c+d/3=15

Total sum is
a+b+c=48 --------eq1
b+c+d=45 --------eq2

Given last no i.e (d) =18
Solving eq(2) we get
b+c=27--------eq(3)
substitue eq(3) in eq(1)
We get a=21
7 years agoHelpfull: Yes(0) No(0)

Wipro Other Question

The average of 25 results is 18. The average of first twelve of them is 14 and that of last twelve is 17. The thirteenth result is :

a. 28
b. 78
c. 72
d. 85 Mukesh has twice as much money as Sohan and Sohan has 50% more money than what Pankaj has. If the average money with them is Rs. 110, then Mukesh has :

a. Rs. 55
b. Rs. 60
c. Rs. 90
d. Rs. 180