OG PS-243

[mimichu]

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 fractions of a yard?

A. 1/6 and 1/5 only
B. 1/4 and 1/3 only
C. 1/6, 1/4, and 1/3
D. 1/12, 1/6, and 1/4
E. 1/12, 1/6, and 1/3

ANS D 算不出答案 而且問題好像怪怪的??

[amazingslim]

ㄧ條管子切分為3等分及4等分，畫圖試看看
第一個及最後一個1/4皆沒被3等分切到
1/3-1/4=1/12
2/4-1/3=1/6
2/3-2/4=1/6
3/4-2/3=1/12