Ratio of incomes of 2 friends is 9:7 & ratio of their expenditures is 4:3. If each of them saves Rs2000p.m find their monthly incomes.
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let the income be x
and expenditure be y
salary of friend A = 9x
and b = 7x
Expenditure of A = 4y
and B = 3y
ATQ
9x- 4y = 2000 ........(1) *3
7x-3y = 2000..........(2) * 4
27x-12y = 6000
28x-12y = 8000
- + -
= -x = -2000
= x = 2000
So monthly income of A = 9*x = 9*2000 = 18000
and B = 7x = 7*2000 = 14000
and expenditure be y
salary of friend A = 9x
and b = 7x
Expenditure of A = 4y
and B = 3y
ATQ
9x- 4y = 2000 ........(1) *3
7x-3y = 2000..........(2) * 4
27x-12y = 6000
28x-12y = 8000
- + -
= -x = -2000
= x = 2000
So monthly income of A = 9*x = 9*2000 = 18000
and B = 7x = 7*2000 = 14000
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