Question

Q:7. A sum of rupees 500 is in the form of notes of denominations of rupees 5 and rupees 10, if the total number of notes is 90. find the number of notes of each type. *​

Answer 1

Answer:

A sum of rupees 500 is in the form of the denominations of rupees 5 and rupees 10. If the total number of notes is 90, what is the number of notes of each type?

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3 Answers



Anil Khedar, works at National Thermal Power Corporation

Answered 3 years ago · Author has 508 answers and 666.7K answer views

Lets assume you have x notes of rs 5 and y notes of rs 10. So you have

x+y =90

And 5x+10y=500.

Puting x=10-y in 2nd equation you have

5(90-y)+10y=500.

450–5y+10y=500

5y=500–450

y=50/5=10.

Hence x=90–10=80.

So ans is 80 notes of rs 5 and 10 notes of 10.

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