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For the manufacture of Portland cement, the proportions of raw materials used, are

lime 63% ; silica 22% ; other ingredients 15%
lime 22% ; silica 63% ; other ingredients 15%
silica 40% ; lime 40% ; other ingredients 20%
silica 70% ; lime 20% ; other ingredients 10%.

Correct Answer: lime 63% ; silica 22% ; other ingredients 15%

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