In the image below, can you find the value of an angle(y)

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

Decode below rebus
D
N
A
T
S , D

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What does below Rebus mean ?

esgg sgeg gegs gsge

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?