Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you count the number of triangles in the picture below?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?