What is black when you buy it, red when you use it, and gray when you throw it away?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

There is a place where if I stand up straight, I will still be considered sideways.

Can you count the number of triangles in the given figure?

Count the Triangle in the figure given below:

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?