(25)7.5 x (5)2.5 ÷ (125)1.5 = 5?

Question: (25)7.5 x (5)2.5 ÷ (125)1.5 = 5?
[A].

8.5

[B].

13

[C].

16

[D].

17.5

Answer: Option B

Explanation:

Let (25)7.5 x (5)2.5 ÷ (125)1.5 = 5x.

Then,	(52)7.5 x (5)2.5	= 5x
	(53)1.5

	5(2 x 7.5) x 52.5	= 5x
	5(3 x 1.5)

	515 x 52.5	= 5x
	54.5

5x = 5(15 + 2.5 – 4.5)

5x = 513

x = 13.