225. a straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fraction of a yard?
答案是：1/12,1/6 and 1/4
这题即使看了后面的答案和图解，也不太明白。可能主要是不明白前半句话是什么意思“a straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings,”特别是“in fourths and also in thirds”
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