I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Solve below popular number sequence
314 159 265 358 979 323 846 ?

I make two people out of one. What am I?

What has many keys but can’t open a single lock?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?