If x : y = 3 : 4, then (4x + 5y) : (4x-5y) is
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x/y = 3:4 ------ (1)
= (4x+5y/(4x - 5y)
= y(4x/y + 5)/y(4x/y - 5)
= 4 * 3/4 + 5 / 4 * 3/4 - 5
=8 / -4
= -2 : 1
= (4x+5y/(4x - 5y)
= y(4x/y + 5)/y(4x/y - 5)
= 4 * 3/4 + 5 / 4 * 3/4 - 5
=8 / -4
= -2 : 1
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