Question

The ratio of incomes of two persons is 9:7 and ratio of their expenditure is 4:3. If each of them manages to save Rs. 2000 per month, Find their monthly income

Answer 1

since the income n expenditure are given in the form of ratios ot means proper income n expenditure are not given to us... let x and y be the factors which when multiplied to the ratios gives us the proper income n expenditure. .so let income of first person b 9x and second person be 7x then the expenditure made by first person b 4y n second person b 3y ......then as per condition 9x-4y=2000 also 7x-3y=2000...as they save Rs 2000
then we have multiple choices to solve this linear equations in 2 variables ...either by substitution or by elimination method ...solve it n get the answer; )