RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

Question : 7 of 119

Marks: +1, -0

If P : Q

= 3/ 5: 5/ 7

and Q : R

= 3/4:2 / 5

, then what is P : Q : R equal to?

Solution:

(b) Given, P : Q =

3/ 5:5 /7

...(i)
Q : R =

3 /4:2/5

...(ii)
From Eq. (i),
P : Q =

3 /5×3/4 : 5/7× 3/4

9/20 : 15/28

...(iii)
From Eq. (ii),
Q : R =

3/4× 5/7 : 2 /5× 5 /7

=15 /28: 2/ 7

...(iv)
From equations (iii) and (iv),
P : Q : R =

9 /20: 15/28 : 2/7

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