Question

He ratio of income of a and b is 5: 4 and their expenditure is as 3: 2. If at the end of the year, each saves rs. 800, then the income of a is

Answer 1

5x+4x = 9x

3x+2x = 5x

9x-5x = 800

4x = 800

x = 200

Answer 2

Answer:

Step-by-step explanation:

Let their income be x and expenditure be y.

A

′

s income =5x

B

′

s income =4x

A

′

s expenditure =3y

B

′

s expenditure =2y

Save money =Rs.1600

⇒ Income - expenditure = saves

⇒ 5x−3y=1600 ---- ( 1 )

⇒ 4x−2y=1600 --- ( 2 )

Multiply equation ( 1 ) by 2 and equation ( 2 ) by 3, we get,

⇒ 10x−6y=3200 ---- ( 3 )

⇒ 12x−6y=4800 ---- ( 4 )

By subtracting ( 4 ) from ( 1 ) we get,

⇒ x=800

⇒ Income of A=5x=5×800=Rs.4000