Discussion
Blending 60 litres of an oil of 100 cSt with 40 litres of one of 25 cSt gives, on a simple linear basis, about
Answer: C
Correct answer: 70 cSt
On a simple linear blend by volume, \[ \frac{60 \times 100 + 40 \times 25}{100} = \frac{6000 + 1000}{100} = 70\ \mathrm{cSt}. \] Real blending indices are logarithmic rather than linear, so an actual blend would come out below this - the linear figure is a first estimate rather than a prediction.
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