Question 30

What is the third proportional to 10 and 25?

Solution

Three numbers a,b,c are in proportion iff $$b^2 = ac$$

Here, a = 10 and b = 25

=> $$(25)^2 = 10 \times c$$

=> $$c = \frac{625}{10}$$

=> $$c = 62.5$$

=> Ans - (C)

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