Question

Income of a,b are 3500₹and4200₹ respectively.the ratio of savings of a and b 4:3 and the ratio of their expenditures is 3:4 then saving of a is

Answer 1

800
savings of a + expenditure of a =3500
savings of b + expenditure of b =4200
savings of a / savings of b=3/4
expenditure of a / expenditure of b=4/3
by solving savings of a =800

Answer 2

let expenditure of a is 3X and of b is 4x
and their saving be 4y n 3y .
then income of a
3X+4y=3500
multiply by 4
12x+16y=14000.....(1)
than income of b is
4X+3y=4200
multiply by 3
12x+9y=12600
12x+16y-7y=12600
14000-7y=12600.....(from1)
7y=14000-12600=1400
y=200
saving of a is 4y=800