a sum of rupees 500 is in the form of notes of denomination of rupees 5 and 10 if the total number of nodes is 90 find the number of notes of each type
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Let the number of rupees 5 notes be x and the number of rupees 10 notes be y.
So total number of notes = x+y= 90-------(1)
As the sum of 5 notes and 10 notes is Rs.500
Also=> 500 = 5x + 10y
Subtracting (2) from (1)
=>x+2y= 100-------(2)
=>x+2y-x-y = 100-90
=>y= 10, x= 80
So the number of Rs. 5 note is 80 and Rs.10 note is 10.
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So total number of notes = x+y= 90-------(1)
As the sum of 5 notes and 10 notes is Rs.500
Also=> 500 = 5x + 10y
Subtracting (2) from (1)
=>x+2y= 100-------(2)
=>x+2y-x-y = 100-90
=>y= 10, x= 80
So the number of Rs. 5 note is 80 and Rs.10 note is 10.
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