A cadet walks 13 km towards the South. He then takes a strict 90-degree right turn and walks another 13 km. Finally, he takes another 90-degree right turn. Which geographic direction is he currently facing?

Identify the missing letter in the given alphabetical series: I, L, O, R, ?

In a specific numerical substitution code, if the word 'CAT' is coded as 24, and 'DOG' is coded as 26, what will be the code for the word 'BIRD'?

In a specific numerical substitution code, if the word 'TIN' is coded as 43, and 'IRON' is coded as 56, what will be the code for the word 'GOLD'?

What comes next in the following mathematical series? 6, 19, 58, 175, ?

What comes next in the following mathematical series? 7, 24, 75, 228, ?

What comes next in the following mathematical series? 7, 17, 37, 77, ?