(related to Problem: Mixing The Tea)
There are three ways of mixing the teas. Taking them in the order of quality, $2$s. $6$d., $2$s. $3$d., $1$s. $9$p., mix $16$ lbs., $1$ lb., $3$ lbs.; or $14$ lbs., $4$ lbs., $2$ lbs.; or $12$ lbs., $7$ lbs., $1$ lb. In every case, the twenty pounds mixture should be worth $2$s. $4.5$d. per pound; but the last case requires the smallest quantity of the best tea, therefore it is the correct answer.
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