Quick Maths Riddle

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?




Similar Riddles

On 26-01-2022, Juli was murdered at her house in a city in India in the afternoon. There were three suspects in the murder and the following are the statements that were given by them:

John: I visited my village that day.
Jacob: I was out to deposit my house tax in the municipality office at that time.
Jonny: I was at a friend's place having lunch at that time.

Can you find out who is the murderer?

Asked by Neha on 15 Dec 2023


Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Asked by Neha on 01 Jun 2024

What can jump higher than a building?

Asked by Neha on 24 Oct 2025


How many letters are in the alphabet?

Asked by Neha on 01 Sep 2025

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Guess Movie Name

Asked by Neha on 14 Feb 2021

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Asked by Neha on 30 Jan 2024


Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Nine Numbers Riddle

Asked by Neha on 21 Jun 2021

What Time Should the last watch show in the below figure?

Time in the Clock

Asked by Neha on 21 Sep 2024

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

Asked by Neha on 11 Mar 2026


We know that money can be names differently for the purpose it is used for. Some of the examples of money given at following places or for following activities:

In temple = Daan
In school = Fees
During marriage = Dowry
For divorce = Alimony
Paying government = Tax
In court = Fine
Employer to employee = Salary
To kidnappers = Ransom
For illegal reason = Bribe
To civil servant retirees = Pension

Do you know what do we call the money a husband gives to his wife?

Asked by Neha on 12 Jan 2021

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.