Q. The ratio of incomes of two friends, Jasmine and Aman is 9:7 and the ratio of their expenditures 
is 4:3. If each of them saves Rs. 6,000 per month, find their monthly incomes. Also, if each of them denotes 2% of her/his income to a charity working for old age institutes, find the resulting savings Of each. What value is indicated from this action? 

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Ratio of income = 9 : 7?

let us assume inc. = x

?Jasmin income = 9X

Armaan income = 7X

Ratio of expenditure = 4:3

jasmine expenditure = 4X

Armaan expenditure = 3X

Both savings = 6000

Jasmine = SAVINGS= 9X -4X
6000= 5X
6000/5= X
X= 1200

9X = 9 * 1200

9X = RS.10800

2 % Donated

So 2% Of 10800 = 216

Final Savings = 6000 - 216

= RS 5784

Armaan

Savings = 7X - 3X

6000= 4X

6000/4= 1500

X = 1500

7X = 7 * 1500

7X= RS 10500

2% Donated

So 2% Of 10500 = 210

Final Saving= 6000 - 210

=RS 5790

Let the income of Jasmine=9x And,the income of Aman=7x 9x-4x=6000 (1) 7x-3x=6000 (2) Multiply 3 in equation 1 and multiply 4 in equation 2. 27x-12x=18000 (3) 28x-12x=24000 (4) Subtract equation 4 from equation 3. 28x-12x=24000 27x-12x=18000