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let the income be x and expenses be y
since the incomes of Aand B are in the ratio 4:5,
A=4x
B=5x
the expenses of A and B are in the ratio 5:6,
A=5y
B=6y
since Income- expenses= SAVINGS
4x-5y=73-------(1)
5x-6y=73-------(2)
solve the equation and you'll get the answer
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