If x: y = 7:5, then the value of (5x - 2y):(3x + 2y) is
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x : y=7 : 5
=> x/y=7/5
=> x=7y/5
(5x-2y) : (3x+2y)
=(5.7y/5-2y) : (3.7y/5+2y)
=(35y/5-2y) : (21y/5+2y)
=(35y-10y)/5 : (21y+10y)/5
=25y/5 : 31y/5
=25y : 31y
=25 : 31
=25/31
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