2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you find out the total number of triangles in the given figure?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

Which is the smallest number that you can write using all the vowels exactly once?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

What's the only room from which no one can enter or leave

What Deficiency does the below rebus represent?

VIT_MIN

How can you leave a room with two legs and return with six legs?

What word begins and ends with an E, but has only one letter?