monthly income of a and b is 5:4, and ratio of monthlu expenditures is 7:5, if each saves rs.9000 then what is monthly income of a
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a/b = 5/4
4a = 5b
a = 5b/4
(a-9000)/(b-9000) = 7/5
5a - 5×9000 = 7b - 7×9000
5a - 7b = 5×9000 - 7×9000
5×5b/4 - 7b = -2×9000
(25b - 28b)/4 = - 18000
-3b = -18000×4
b = 18000×4÷3 = 24000 Ans
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