When 500 rupees note was changed rohan got 20 rupees note there are 30 notes in all .find the number of 10 rupees notes and 20 rupees notes ?

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Solution

Let the number of 20 rupee notes = X
and 10 rupee notes=Y
total 30 notes; X+Y=30-------1
total 500 rupees; 20X+10Y=500---------2
By solving equation 1 and 2
X=10,Y=20
number of 20 rupee notes=20
number of 10 rupee notes =10

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