Sawaal
30
Q:

Third proportion of 10 and 20 is

A) 30 B) 40
C) 25 D) 20

Answer:   B) 40



Explanation:

The third proportional of two numbers p and q is defined to be that number r such that

p : q = q : r.

 

Here, required third proportional of 10 & 20, and let it be 'a'

=> 10 : 20 = 20 : a

10a = 20 x 20

=> a = 40

 

Hence, third proportional of 10 & 20 is 40.

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