The ratio of weekly incomes of A and B is 9: 7 and the ratio of their expenditures is 4 : 3. If each saves Rs. 200 per week, then the sum of their weekly incomes is |
A) Rs. 3200
B) Rs. 4200
C) Rs. 4800
D) Rs. 5600
Correct Answer: A
Solution :
Let the weekly incomes of A and B be 7x and their expenditures be 4y and 3y. |
According to the question, |
\[9x-4y=200\] |
\[7x-3y=200\] |
Solving, \[x=200,\]\[y=400\] |
\[\therefore \] Sum of their weekly incomes |
\[=9x+7x=16x=\text{Rs}.\,\,3200\] |
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