2002 · Q58
The flowers in a basket become double every minute and the basket gets full in one hour. In how much time, the basket was 1/32 full?
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A12 minutes
- B32 minutes
- C45 minutes
- D55 minutes
Explanation
The flowers double every minute, so going backwards the quantity halves each minute. One-half of full is reached 1 minute before the hour, one-quarter 2 minutes before … and 1/32 = (1/2)⁵ is reached 5 minutes before the hour — at 55 minutes. Hence (D) is correct.