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let 5rs and 2rs coins=x
one rs coins =40-2x
5x+2x+(40-2x)=120
5x+2x+40-2x=120
40+5x=120
5x=120-40
x=80/5
x=16
one rs coins =40-2x
5x+2x+(40-2x)=120
5x+2x+40-2x=120
40+5x=120
5x=120-40
x=80/5
x=16
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