Question

The ratios of income, expenditure and savings of Arvind and Navin are respe
tively 5: 3, 8:5 and 2:1. The joint savings of both of them are 3,600 in a year
find their monthly incomes.​

Answer 1

let A's and B's income be 5y and 3y respectively. and their expenditure be 8z and 5z respectively.

let their savings be 2x and x respectively.

ATQ

2x+x=3600

x=1200

now,

5y-8z=2x

5y-8z=2400.....(1)

&. 3y-5z=x

3y-5z=1200......(2)

multiply eqn (1) by 5 and eqn (2) by 8 and subtract eqn (2) from eqn (1)

on solving we get

y = 2400

hence

A's income =5y =5*2400=12000.