Chandan Singh Gughtyal has been teaching Maths in boarding schools in India for about 28 years. He has experience of working as an assistant housemaster, housemaster, resident dorm parent, and dorm ...

So, the difference between their age is given by => 31 – 8 = 23 years. Now, let the age of his father be 'x'. Let the age of his son be 'x-23'. Also Read: Math Riddles with Answers: Logic Puzzles That ...

Explanation: To kill 7 rats, it would take 7 cats: 7 × 7 = 49 mins To kill 1 rat, it takes 1 cat, that is: 49/7 = 7 mins Since, the job is to kill 100 rats, it would take 1 cat, that is: 7 × 100 = 700 ...