Question:The ratio between two numbers is `3 : 4` and their `1`c.m is `180`. The first number is : 

A `60` 
B `45` 
C `20` 
D `15` 

+ Answer
B 

+ Explanation
Let the numbers be `3x`and `4x`.

Then, their `1`c.m `= 12x`.

Now, `12x = 180`

`iff x = 15`.

`:.`First number `= 45`.

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Md. Habib Ullah

Editor, VCampus

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