In which direction should the missing arrow point?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

What is next number in the pattern below:

131 517 192 123 ?

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

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

why number 8549176320 is one of a kind?

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

What's the best place to go shopping in the ocean?

Solve the puzzle by telling what does below picture means.