The flowers in a basket double every minute and the basket gets full in one hour. In how much time, the basket was $\frac{1}{32}$ full?
(a)12 minutes
(b)32 minutes
(c)45 minutes
(d)55 minutes
Answer
Answer (as printed): D
Explanation
Since the number doubles every minute, so the basket was $\frac{1}{2^{n}}$ full in $(60-n)$ minutes. Thus, it was $\frac{1}{32}\left(=\frac{1}{2^{5}}\right)$ full in (60-5) i.e., 55 minutes.
Explanation as extracted from the printed page; notation may be imperfect.