Discussion
Seed of \( 1000 \) kg contains \( 42 \) per cent oil. Pressing leaves cake of \( 640 \) kg at \( 7 \) per cent oil. The oil recovered is
Answer: A
The seed holds \( 420 \) kg of oil and the cake retains \( 640 \times 0.07 = 44.8 \) kg, so \( 420 - 44.8 = 375 \) kg is recovered. The extraction efficiency is therefore about 89 per cent, which is typical of a well-set expeller on a high-oil seed.
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