Question

Shipra has 36 coins in her piggy bank. It contained some 25 paisa coins, some 10 paisa coins, and some 5 paisa coins. The total amount of money was rs.3. How many of each coin does she have ?

Answer 1

Let :-
No. of 25 p coins.= x
No. of 10 p coins = y
No. of 5 p coins= z
Total coins = 36
x+y+z = 36
((x = 36-y-z))
((y = 36-x-z))
Amount of total coins = Rs.3 = 300 p
25x + 10y + 5z = 300
((x= 300-10y-5z/25 = 60-2y-z/5))
{{36-y-z = 60-2y-z/5
180-5y-5z = 60-2y-z
180-60 = -2y-z+5y+5z
120 = 3y+4z}}
((y = 300-25x-5z/10 = 60-5x-z/2))
{{36-x-z = 60-5x-z/2
72-2x-2z = 60-5x-z
72-60 =