Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Solve the equation in the image by looking at the pattern closely.

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

You need to arrange three 7 and mathematical symbols to form number 1?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

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)?

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