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?

Answer: An hour because the first pill doesn't take 30 min. to take

More Math Riddles with answers

More Math Riddles

You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?
You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?
Your shirt has two holes in it. How many holes are there?
'How much is this bag of potatoes?' asked the man. '32lb divided by half its own weight,' said the green grocer. How much did the potatoes weigh?
2 men catch 2 fish in 2 minutes. At this rate, how many men could catch 500 fish in 500 minutes?
20+20+20=60. How can you make 60 again by using the same number 3 times, but it can’t be 20?
8, 5, 4, 9, 1, 7, 6, 3, 2 These numbers are in a specific order. What is the pattern?
81 x 9 = 801. What must you do to make the this equation true?
A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?
A bat and a ball cost $1.10. The bat costs one dollar more than the ball. How much does the ball cost?
A bird has a head 9cm long. The tail is equal to the size of the head plus a half of the size of the body. The body is the size of the head plus the tail. How long is the bird?
A box of hardware contains nuts and bolts. The bolts account for 25 percent of the number of items in the box. What percentage are the bolts of the entire box?