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

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

The dirtier I get, the whiter I look. Who am I?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

Imagine you are in a room with no windows or doors. How will you get out?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

People put me on the table and cut me but do not eat me. What am I?