16) A Sum of 500 is the form of denomination
of rs. 5 and rs. 10. If the total number of
notes is 90,find the number of notes of
each type
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Answer:
let the no. of rs5 notes be x and 10 rs notes be y
x+y =90
5x+10y=500
x+2y=100
(90-y)+2y=100
90+y =100
y=10
x= 90-y=90-10=80
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