SSC CHSL Model Paper 1

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Question : 32 of 100

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?

$3/5:5/7:2/5$
$9/20:15/28:2/7$
$3/5:3/4:2/5$
$3/5:5/7:3/4$

Solution:

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= 3/4×5/7:2/5×5/6

=15/28:2/7

...(iv)
From equations ( iii) and (iv).

P : Q : R =9/20:15/28:2/7

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