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I can't read it sry
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Let the monthly income of one person be 4x and that of the other be 5x
Let the monthly expenses of one person be 7y and that of the other be 9y
ATQ
4x-7y=50-(1)-*5=20x=35y=250
5x-9y=50-(2)-*4=20x-36y=200
=y=50
from 1
4x-7*50=50
4x=50+350
4x=400
x=100
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