How many seconds are there in one year?
20+20+20=60. How can you make 60 again by using the same number 3 times, but it can’t be 20?
Use the number 5 three times, 55+5=60
You go to the doctor because you're ill and he prescribes you with 3 pills and tells you to take them every half hour. How long do the pills last you?
An hour because the first pill doesn't take 30 min. to take