Question

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

Answer 1

Answer:

let there be x notes of 5 and y notes of 10

x+y = 90----(1)

5x+10y=500

x+2y= 100---(2)

x+y. = 90----(1)

-_-___-______(by subtracting)

y = 10

so x = 80

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Answer 2

Answer:

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