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A 100 rupees note was changed into 10 rupees notes and 20 rupees notes.there were 7 notes in all how many of each notes were there.what is the equation of

this question?


I did it without any equation. we need the sum 100.
so 100=20*3+10*4. that is it.
so there were 3 twenty rupee notes and 4 ten rupee notes

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Yes it can be: 100=20*3+10*4
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