The cost of four dozen proof machine ribbons and five dozen accounting machine r

The cost of four dozen proof machine ribbons and five dozen accounting 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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The cost of four dozen proof machine ribbons and five dozen accounting machine ribbons was Rs.160/-...

Answer / demon

4dozen P + 5dozen A = rs .160/-
1dozen A = rs. 20/-
5dozen A = rs. 20/- * 5 = rs. 100/-

4dozen P = rs. 160 - 100 = rs. 60/-
1dozen P = rs. 60/4 = rs.15/-

answer is rs. 15/-

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