A website Maths Puzzle Logical Reasoning

Suppose you're in a hallway lined with 100 closed lockers.
You begin by opening every locker. Then you close every second locker. Then you go to every third locker and open it (if it's closed) or close it (if it's open). Let's call this action toggling a locker. Continue toggling every nth locker on pass number n. After 100 passes, where you toggle only locker #100, how many lockers are open?

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A website Other Question

If in coded language
RAHUL = 18812
SURENDRA = 19181418
VIPUL = 221612
Then
PRAVEEN = ?

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If 125207 is "Hi", and 031993121212 is "Dude", then 125207031993121212 is "Hi Dude".

Then what is 799717777010909230151693122001983?