RRB NTPC Mains or Stage 2 Model Paper 4 with solutions

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Question : 38 of 120

Marks: +1, -0

If

x : y = 3 : 4,

then

(7x + 3y) : (7x – 3y)

is equal to :

5 : 2
4 : 3
11 : 3
37 : 19

Solution:

x/y= 3/4⇒ {7x} /{3y}=7/ 3 ×3/4=7/4

By componendo and dividendo,

{7x +3y}/{7x -3y}={ 7+ 4} /{ 7 -4}=11/ 3

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