Spot 5 differences in two Christmas tree below:

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

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?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Prove that twice of ten is the same as twice of eleven.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Which country gets ill every time?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?