Question

solve 28 and 29 questions​

Answer 1

let the incomes be 11x and 7x

let there expenditures be 9y and 5y

according to problem,

11x+9y=400.....(1) x7

7x+5y=400......(2) x11

solving 1 and 2

we get,

77x+63y=2800

77x+55y=4400

(-) (-) (-)

8y=-1600

y=-200

×=200