Question

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?

Answer 1

Answer:

Cost of a dozen proof machine ribbon is Rs 15

Step-by-step explanation:

Given that

Cost of 4 dozen proof machine ribbons + Cost of 5 dozen accounting machine ribbon = Rs 160

Also, cost of 1 dozen accounting machine ribbon = Rs 20

Thus, cost 5 dozen accounting machine ribbon $= 5 \times 20 = \hspace{0.1cm}Rs\hspace{0.1cm}100$

Thus, cost of 4 dozen proof machine ribbon $= Rs\hspace{0.1cm}160 - Rs\hspace{0.1cm}100 = Rs\hspace{0.1cm}60$

So, Cost of 1 dozen proof machine ribbon $= \frac{60}{4} = Rs\hspace{0.1cm}15$