Question

从 $\dfrac{1}{4}$ 到 $\dfrac{3}{4}$ 的三分之一处是哪一个数？

What number is one third of the way from $\dfrac{1}{4}$ to $\dfrac{3}{4}?$

$\dfrac{1}{3}$

$\dfrac{5}{12}$

$\dfrac{1}{2}$

$\dfrac{7}{12}$

$\dfrac{2}{3}$

间距是 $\dfrac{3}{4} - \dfrac{1}{4} = \dfrac{1}{2}$ 。走三分之一处就是加上 $\dfrac{1}{3} \cdot \dfrac{1}{2} = \dfrac{1}{6}$ 。

所以这个数是 $\dfrac{1}{4} + \dfrac{1}{6} = \dfrac{3}{12} + \dfrac{2}{12} = \dfrac{5}{12}$ 。

因此，正确答案是 B。

The gap is $\dfrac{3}{4} - \dfrac{1}{4} = \dfrac{1}{2}.$ One third of the way adds $\dfrac{1}{3} \cdot \dfrac{1}{2} = \dfrac{1}{6}.$

So the number is $\dfrac{1}{4} + \dfrac{1}{6} = \dfrac{3}{12} + \dfrac{2}{12} = \dfrac{5}{12}.$

Thus, the correct answer is B.