What do you see in the given picture?

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

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

What happened when the wheel was invented?

Different lights make me strange by changing me into different sizes. What am I?

What has many teeth, but cannot bite?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Find out the missing number in the picture attached: