Question

a lady went to a bank with rupees 100000 she has the cashier to give for rupees 500 and 1000 currency notes in return she got 175 currency notes in all find the number of each kind of currency notes

Answer 1

Set up two equations
x + y = 175........(1)
500x + 1000y = 100,000......(2)
Multiply Equation (1) by 500
500x + 500y = 87,500.......(1)
500x + 1000y = 100,000......(2)
Subtract Equation (1) from (2)
......500y = 12,500
.........y = 25
Substitute y = 25 in Equation (1)
x + y = 175........(1)
x + 25 = 175
x = 175 - 25
x = 150
The lady was given:-
150 x Rs500 notes
25 x Rs1000 notes
Hope this helps :-)