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If $a/b=1/3, b/c=2, c/d=1/2, d/e=3$ and $e/f=1/4$ then what is the value of $abc/def?$

1. $3/8$
2. $27/8$
3. $3/4$
4. $27/4$
5. $1/4$

Given $\frac{a}{b}=\frac{1}{3}$                 $\frac{b}{c}={2}$                      $\frac{c}{d}=\frac{1}{2}$

$\frac{d}{e}=3$                  $\frac{e}{f}=\frac{1}{4}$

b=3a=2c=d   => d=3a

b=2c=d=3e => e =  $\frac{b}{3}$

c = $\frac{d}{2} = \frac{3e}{2} = \frac{3f}{8}$

$\frac{a}{d} *\frac{b}{e} * \frac{c}{f}$ =  $\frac{a}{3a} *\frac{b}{\frac{b}{3}} * \frac{c}{\frac{8c}{3}}$

=$\frac{3}{8}$
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