total monthly income of two persons is rs.7500.they spend 90%and 80% of their incomes respectively.if the ratio of their monthly savings is 3:4 what are their monthly incomes?
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let the incomes be x, y
x+y=7500
atq
10%x/20%y=3/4
=>x/2y=3/4
=>x=3y/2
thus
3y/2+y=7500
5y=15000
y=3000
x=4500
x+y=7500
atq
10%x/20%y=3/4
=>x/2y=3/4
=>x=3y/2
thus
3y/2+y=7500
5y=15000
y=3000
x=4500
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