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1. 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

Solution:

\begin{aligned} A + B + C = 12000 \times 3 \\ B + C + D = 15000 \times 3 \\ \to D - A = 3000 \times 3 = 9000 \\ Also, D = 2 A \\ Then, D = 18000 and A = 9000 \\ Therefore, \\ Average salary of B and C, \\ = \frac{45000 - 18000}{2} \\ = 13500 \end{aligned}

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