Question

11. If (3x + 5y) : (3x - 5y) = 7:3, find x : y.
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Answer 1

Given that, 3x+5y:3x-5y=7:3

or, 3x+5y/ 3x-5y= 7/3

or, 3(3x+5y)=7(3x-5y)

or, 9x+15y= 21x-35y

or, 20y=12x

or,5y=3x

or, y= 3x/5

Now, x:y

=x/y

= x/ 3x/5

=5x/3x

=5/3

So,x:y=5/3