Question

A Piggy bank contains only 20p coins.If the total value of the money is rupees 60,find the no. of coins in the piggy bank

Answer 1

Let there be N coins in the piggy bank.
1 paise = 1/100 Rupee as 1 rupee = 100 paise
Value of Each coin = 20 paise = 20 * 1/100 Rupees  = 1/5 Rupees

Total Value of N coins =  N * 1 / 5 Rupees
This is equal to Rupees 60
So  N / 5 = 60                So  N = 5 * 60 = 300 coins
SO there are 300 coins in the pigggy bank.

You can do this directly as :  (second method)
 Number of coins =  total value of all coins / value of each coin
                           = 60 Rupees / 20 paise  = 60 * 100 paise / 20 paise
                       = 6000 / 20  = 300

Answer 2

 X is coins in  piggy bank.
1 paise = 1/100 Rupee
Value of Each coin = 20 paise = 20 * 1/100 Rupees  = 1/5 Rupees

Then X coins will be =  X * 1 / 5 Rupees
This is equal to Rupees 60
X / 5 = 60
X = 5 * 60 = 300 coins