Question

if x:y=3:4,then(7x+3y):(7x-3y)=?

Answer 1

here is your Answer
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X:y = 3:4
so
X = 3
y = 4

putting the value
(7x+3y)
=>(7×3+3×4)
=> 21+12
=> 33

now
(7x-3y)
=>( 7×3 -3×4)
=> 21-12
=> 9

Thus
(7x+3y) : (7x-3y) => 33: 9
==> 11:3
Ans