A bag contains one rupee, 50 paise and 25 paise coins in the proportion 5 : 7 : 9. If the total amount in the bag is ₹430, then how many 25 paise coins are there?

360

Denominations - 1rupee : 50 paise : 25 paise  

                             5     :     7       :    9

Total amount = ₹430                    

 (1r x 5) + (0.50r x 7) + (0.25r x 9) = 430       

      5r  +  3.5r + 2.25r   = 430

                 10.75r          = 430     ⇒ r = 40

No. of 25 paise coins = 9 x 40 = 360