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Answer:
Either 2 or 3 depending on whether the initial two is halved first.
"half of two" plus two
or
half of "two plus two"
The normal rules of BIDMAS/BODMAS do not apply to this question as this is not a mathematical expression, i.e. it is a written as an English question, and not a wellformed Mathematics question.
The Miller next took the company aside and showed them nine sacks of flour that were standing as depicted in the sketch. "Now, hearken, all and some," said he, "while that I do set ye the riddle of the nine sacks of flour. And mark ye, my lords and masters, that there be single sacks on the outside, pairs next unto them, and three together in the middle thereof. By Saint Benedict, it doth so happen that if we do but multiply the pair, 28, by the single one, 7, the answer is 196, which is of a truth the number shown by the sacks in the middle. Yet it be not true that the other pair, 34, when so multiplied by its neighbour, 5, will also make 196. Wherefore I do beg you, gentle sirs, so to place anew the nine sacks with as little trouble as possible that each pair when thus multiplied by its single neighbour shall make the number in the middle." As the Miller has stipulated in effect that as few bags as possible shall be moved, there is only one answer to this puzzle, which everybody should be able to solve.
[Ref: ZYIT] The Miller's Puzzle. The Canterbury Puzzles And Other Curious Problems by Henry Ernest Dudeney (1907).
Hint: The two left numbers multiplied, or the right two numbers, should create the central number.
Answer:
The way to arrange the sacks of flour is as follows: 2, 78, 156, 39, 4. Here each pair when multiplied by its single neighbour makes the number in the middle, and only five of the sacks need be moved.
There are just three other ways in which they might have been arranged (4, 39, 156, 78, 2; or 3, 58, 174, 29, 6; or 6, 29, 174, 58, 3), but they all require the moving of seven sacks.
Puzzle 448
Each of these words can be split in half, and two letters can be placed in the middle to create a new six letter word.
For example BEND can be split into BE and ND, YO can be placed in the middle to create BE + YO + ND = BEYOND.
The four added pairs of letters, in order, spell an 8letter word  what is that word?
LEND >> LE + GE + ND = LEGEND
LIAR >> LI + NE + AR = LINEAR
THAT >> TH + RO + AT = THROAT
COIN >> CO + US + IN = COUSIN
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