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
Answer: Option C
Solution(By Examveda Team)
$$\eqalign{ & A + B + C = 12000 \times 3 \cr & B + C + D = 15000 \times 3 \cr & \to D - A = 3000 \times 3 = 9000 \cr & {\text{Also}},\,D = 2A \cr & {\text{Then}},\,D = 18000\,{\text{and}}\,A = 9000 \cr & {\text{Therefore}}, \cr & {\text{Average}}\,{\text{salary}}\,{\text{of}}\,B\,{\text{and}}\,C, \cr & = \frac{{ {45000 - 18000} }}{2} \cr & = 13500 \cr} $$Join The Discussion
Comments ( 2 )
Related Questions on Average
A. 125 km/hr
B. 75 km/hr
C. 135 km/hr
D. 120 km/hr
A+B+C=36000
B+C+D=45000
Then,
B+C=45000-D
Or, A+45000-D=36000
Or, D-A=9000
Thefore, A 9000 and D 18000
From where did D-A =3000*3 came??