A bag contains an equal number of one rupee, 50 paise and 25 paise coins respectively. If the total value is 210, how many coins of each type are there?	Select the correct option:
A) 20 coins  B) 50 coins  C) 100 coins  D) 120 coins  E) none of these

Rationale: "let number of each type of coin = x . then , 1 × x + . 50 × x + . 25 x = 210 ⇒ 1.75 x = 210 ⇒ x = 120 coins answer d"
Answer: D