Question

the ratio of income to expenditure of a family is 5:4 find the saving if the income is $18000

Answer 1

let the ratios be 5x and 4x
therefore
5x+4x=18000
9x=18000
x=18000/9
x=2000
savings=4x
4x=4×2000
=$8000

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Answer 2

let income be 5x and expenditure be 4x
5x+4x =9x
x=2000
4x=4×2000
=8000