A bag has Rs.51.25 in the form of 2- rupee, 50-paise and 25-paise coins in the ratio of 3:5:7. What is the total number of 50-paise coins?

25

                         2Rs.   :   50p   :   25p

No. of coins:        3     :     5     :     7

Value of coins:    6      :   2.5    : 1.75    ⇒ 10.25R = 51.25 (given)

⇒ 1R = 5

⇒ Number of 50- paise coins = 5R = 5 x 5 = 25