A box contain the number of balls which is as much greater than 20 is less than 30. The number of balls is?  Choose the correct answer:
A) 40	B) 25	C) 30	D) 50	E) 35

Rationale: "answer let the number be x . then , x - 20 = 30 - x â ‡ ’ 2 x = 30 + 20 = 50 â ‡ ’ 2 x = 50 â ˆ ´ x = 25 correct option : b"
Answer: B