If x : y = 6 : 5 and z : y = 9 : 25, then what is the ratio of x : z?

This question was previously asked in
SSC GD Previous Paper 3 (Held On: 11 Feb 2019 Shift 3)
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  1. 50 : 33
  2. 54 : 125
  3. 10 : 3
  4. 48 : 25

Answer (Detailed Solution Below)

Option 3 : 10 : 3
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Detailed Solution

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Given:

x : y = 6 : 5

And z : y = 9 : 25

Calculation :

x/y = 6/5     ---- (i)

And z/y = 9/25

⇒ y/z = 25/9     ---- (ii)

Multiply equation (i) and (ii) we get,

(x/y) × (y/z) = (6/5) × (25/9)

⇒ x/z = 10/3

∴ x : z = 10 : 3

Alternate Method 

x : y = 6 : 5     ----- (i)

And z : y = 9 : 25     ---- (ii)

As y is in both the ratios, Multiply (i) × 5 to make equal value of y in both the ratios

x : y = (6 : 5) × 5 = 30 : 25    ---- (iii)

from (ii) and (iii), Since y is same in both the ratios

x : z = 30 : 9 = 10 : 3
 

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