Question

A 100 rupee note was changed into 20Rs notes and 10Rs notes. If there are total 8 notes in all, find the number of each type of notes ​​

Answer 1

Explanation:

Let the number of rs.20 notes be x and rs.10 be y.

Then according to the given conditions, equations formed are:

x+y= 8 (1)

20x+ 10y= 100. (2)

multiplying equation (1) by 10, we get

10x+10y= 80. (3)

Subtract (3) from (2), we get

10x= 20

x= 20/10

x= 2

substituting x=2 in (1), we get

y=8-2

y=6

Therefore, the number of Rs.20 notes are 2 and number of Rs.10 notes are 6 respectively.

Answer 2

Answer:

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