For the manufacture of Portland cement, the proportions of raw materials used are
A.
lime 63% ; silica 22% ; other ingredients 15%
B.
lime 22% ; silica 63% ; other ingredients 15%
C.
silica 40% ; lime 40% ; other ingredients 20%
D.
silica 70% ; lime 20% ; other ingredients 10%
Correct answer is A
No explanation has been provided for this answer.
