The average income of A,B and C is 12000 per month and the average income of B,C and D is 15000 per month. If the average salary of D is twice that of A , then the average salary of B and C is
A. 8000
B. 18000
C. 13500
D. 9000
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A+B+C = 12000*3
B+C+D = 15000*3
=> D-A = 3000*3 = 9000
Also, D = 2A
Then, D = 18000 and A = 9000
Therefore,
Average salary of B and C,
= (45000-18000)/2 = 13,500.