A purse contains some Rs 5 coins and some Rs 10 coins. if the total number of these coins is 20 and the total value of these coins is Rs 165, find the number of Rs 10 coins in the purse.
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13 is your answer
Hope you have get your answer
Hope you have get your answer
sakchi:
please can you show the working
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let the no of my 5 rupee coin be =x
let the no. of my 10 rupee coin be = y
∴x+y = 20.... equation (i)
let the total money of 5rupee coin be = 5x
thetotal money of 10 rupee coin be =10y
∴ 5x+10y =165....... equation (ii)
equation both the equation (i) and(ii)
x+y=20
5x+10y=165
x=20-y
putting the value of x in (ii) equation
5(20-y) + 10y= 165
100-5y+10y= 165
5y = 165-100
5y=65
y=65÷5
y=13
no. of 10 rupee coin is 13
let the no. of my 10 rupee coin be = y
∴x+y = 20.... equation (i)
let the total money of 5rupee coin be = 5x
thetotal money of 10 rupee coin be =10y
∴ 5x+10y =165....... equation (ii)
equation both the equation (i) and(ii)
x+y=20
5x+10y=165
x=20-y
putting the value of x in (ii) equation
5(20-y) + 10y= 165
100-5y+10y= 165
5y = 165-100
5y=65
y=65÷5
y=13
no. of 10 rupee coin is 13
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