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?

2 Answers on this Question

1. Given:
   4( dozen Proof machine)+5(dozen Accounting machine)=160
   Also 1 dozen Accounting machine=20
   Therefore,
   4( dozen Proof machine)+5(20)=160
   4( dozen Proof machine)=160-100
   4( dozen Proof machine)=60
   dozen Proof machine=60/40
   dozen Proof machine=15

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2. 15

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