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Third proportion of 10 and 20 is

Correct Answer: 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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