Discussion
Adding 3 per cent gypsum to 1000 kg of clinker gives ground cement weighing
Answer: D
Correct answer: 1030 kg
The gypsum is added as a percentage of the clinker, so 3 per cent of 1000 kg is 30 kg and the ground cement weighs \[ 1000 + 30 = 1030\ \text{kg.} \] Reading it as 3 per cent of the finished cement would give 1031 kg, a difference too small to matter here but worth being deliberate about in a mass balance.
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