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let ₹10 notes be x
₹20 notes be 50-x
10*x+ 20*(50-x)=800
10x+1000-20x=800
-10x= 800-1000
-10x= -200
x=200/10
x =20
50-x= 30
₹20 notes be 50-x
10*x+ 20*(50-x)=800
10x+1000-20x=800
-10x= 800-1000
-10x= -200
x=200/10
x =20
50-x= 30
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