A pit contains 15 ruby stones and 20 opal stones. Each stone is marked either a or b or c. 20 % of the ruby stones are marked a and 40 % of them are marked c. Similarly, among the opal stones, 45 % are marked b and 30 % are marked c. A woman selects a stone at random. She gets the stone free of cost if the stone is ruby stone and marked c or if it is opal stone and marked a or b. What are the chances of her getting the stone free of cost?
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A pit contains 15 ruby stones and 20 opal stones. Each stone is marked either a or b or c. 20 % of the ruby stones are marked a and 40 % of them are marked c. Similarly, among the opal stones, 45 % are marked b and 30 % are marked c. A woman selects a stone at random. She gets the stone free of cost if the stone is ruby stone and marked c or if it is opal stone and marked a or b. What are the chances of her getting the stone free of cost?
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