Question

if x:y =5:3, then 3x+4y:3x-4y=?​

Answer 1

x/y=5/3
Multiply both sides by 3/4
3x/4y=15/12
Now use c and d method
3x+4y/3x-4y=15/12
Hope this helps :)

Answer 2

Step-by-step explanation:

If x = 5 and y = 3 then,

3x + 4y = ( 3 x 5 ) + ( 4 x 3 )

= 15 + 12

= 27

and

3x - 4y = 15 - 12

= 3

Putting in ratio

27:3 or 9:1