A company own 2 mines A and B, mine A produces 2 tons og high grade ore and 5 tons of low grade ore. Mine B produces 5 tons of high, low and medium grade ore each day. The company needs 120 tons of high grade ore, 160 tons of medium grade ore and 200 tons of low grade ore. How many days does it mine operated it costs 20,000 rupees per day to work each mine. Formulate mathematical problem and solve it Graphically
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