Wipro
Company
Numerical Ability
Averages
The average age of A and B is 20 years. If C replace A the average would be 19 and if C replaces B the average would be 21. What are the ages of A, B and C?
A. 22, 20, 18
B. 22, 18, 20
C. 18, 20, 22
D. 18, 22, 20
E. 22, 19, 20
Read Solution (Total 3)
-
- A+B/2=20 A+B=40
B+C/2=19 B+C=38
C+A/2=21 C+A=42
BY SUBTRACTING A+B=40 AND B+C=38 WE GET A+B-B-C=40-38 A-C=2
BY ADDING A+C=42 AND A-C=2 WE GET 2A=44 A=22
A+C=42 C=42-22=20 C=20
A+B=40 B=40-22 B=18
A=22,B=18,C=20
- 12 years agoHelpfull: Yes(8) No(3)
- option B
A+B=2*20;
C+B=2*19;
A+C=2*21;
By solving the above equations we get the solution
- 9 years agoHelpfull: Yes(0) No(1)
- A+B/2=20 A+B=40---------1
C+B/2=19 C+B=38----------2
C+A/2=21 C+A=42----------3
BY SUBSTRACTING 1&2 A+B=40 AND B+C=38 WE GET A+B-B-C=40-38
A-C=2
NOW SOLVING A-C=2 & A+C=42
2A=44
A=22
SUBSTITUTE A=22 IN A-C=2
C=22-2
C=20
SUBSTITUTE C=20 IN B+C=38
B=38-C
B=38-20
B=18 - 6 years agoHelpfull: Yes(0) No(0)
Wipro Other Question