Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Spot 5 differences in two Christmas tree below:

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What has 13 hearts but no other organs?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

What has lots of eyes, but can’t see?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?