How many times in a given day, minutes and hour clock comes in a straight line ?

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?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you decipher the two rows to find the hidden word?

With the help clues provided in the image, can you find the 5 digit key?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Our product and our sum always give the same answer. Who are we?