If a clock strikes six times in five seconds, then what shall be the number of strikes in ten seconds made by the clock?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 11
The time is taken up by the gaps between the strikes, not by the strikes: the first strike starts the clock at zero, and each later strike ends one gap.
6 strikes have 5 gaps, which take 5 seconds, so each gap is 1 second
In 10 seconds there are 10 gaps
10 gaps need \(10+1=\) 11 strikes
Tip: Doubling 6 to 12 is the slip to avoid: the number of strikes is always one more than the number of gaps.