If each of Bill's steps is $\frac{1}{2}$ metre long, how many steps does Bill take to walk 12 metres in a straight line?
(A) 9
(B) 12
(C) 16
(D) 24
(E) 36
Since each of Bill's steps is $\frac{1}{2}$ metre long, then 2 of Bill's steps measure $1 \mathrm{~m}$.

To walk $12 \mathrm{~m}$, Bill thus takes $12 \times 2=24$ steps.

ANSWER: (D)