If 25% of x is 15 less than 15% of 1500, then x is?  Choose one:
A) 720 B) 750 C) 820 D) 840 E) 860

Rationale: "25 % of x = x / 4 ; 15 % of 1500 = 15 / 100 * 1500 = 225 given that , x / 4 = 225 - 15 = > x / 4 = 210 = > x = 840 . answer : d"
Answer: D