The average income of A, B and C is Rs. 12,000 per month and average income of B, C and D is Rs. 15,000 per month. If the average salary of D be twice that of A, then the average salary of B and C is in Rs. :
A. 8,000
B. 18,000
C. 13,500
D. 9,000
Show Answer
Answer-C
Solution-
Solution(By Apex Team)
$\begin{array}{l}A+B+C=12000\times3\\
B+C+D=15000\times3\\
\rightarrow D-A=3000\times3=9000\\
\text{ Also, }D=2A\\
\text{ Then, }D=18000\text{ and }A=9000\\
\text{Therefore},\\
\text{Average salary of B and C}\\
=\Large\frac{45000-18000}{2}\\
=13500\end{array}$
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