The cost of four dozen proof machine ribbons and five dozen
accouting machine ribbons was Rs.160/-. If one dozen
accounting machine ribbons cost Rs.20/-, what is the cost of
a dozen proof machine ribbons?
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Answer Posted / rbarunkumar
4x+5y=160
4x+5(20)=160
4x=160-100
x=60/4
x=15.
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