If a wheel has 54 spokes, how many spaces are there between the spokes?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10