answer the 8th question
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let 20 notes be x and 5 notes be y
20x+5y=380
20y+5x=320
100x+25y=1900
400y+100x=6400
375y=4500
y=12
x=16
20x+5y=380
20y+5x=320
100x+25y=1900
400y+100x=6400
375y=4500
y=12
x=16
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Hope this helps.....!! May God bless you
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