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If a 12 furnaces consume 14 tones of coal. How much coal would be needed for 18 furnaces at the same rate?
one furnace uses 14/12, so 18 furnaces use 14/12 times 18 coal. this is 21
12/14=6/7 so 12+6=18. and 14+7=21. 21 tons of coal would be needed for 18 furnaces.