Using the alligation diagram shown, what proportion of the three wheat varieties priced at 127 p, 129 p, and 132 p per kg gives a mixture worth 130 p per kg? 
A1:1:1
B1:2:2
C1:1:2
D2:3:5
Answer & Solution
Correct answer: C. 1:1:2
The figure shows the alligation pairing for three ingredients around the mean price of 130 p. The resulting proportional parts are $2:2:4$, which simplifies to $1:1:2$. Therefore the three wheat varieties must be mixed in the ratio $1:1:2$.
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