In an envelope there are some 5 rupee notes. Total amount these notes together is 350 rupees. Number of 5 rupee notes are less by 10 than number of 10 rupee notes. Then find number of 5 rupee and 10 rupee notes

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Solution

Let number of 10 rupee notes=X then number of 5rupee notes=2x-10
The total amount is 350rupees
Therefore the equation for total rupees is:
10x+5(2x-10)=350
10x+10x-50=350
20x-50=350
20x=400
X=20
10rupee notes are 20
5 rupee notes are 30

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