Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

Prove that the below maths equation is true.

8 + 8 = 91

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

What goes up but never comes down?

What is the word or phrase?