8x - 5y = 12000
5x - 3 y = 10000
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According to the question,
8x - 5y = 12000 ...(i)
5x - 3y = 10000 ...(ii)
Solving (i) and (ii), we get
⟹ x = 14000
Difference between monthly incomes of A and B
= 8x - 5x = Rs. 3x = Rs. (3 x 14000)
= Rs. 42000
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