What do you see in the given picture?

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

What has many keys but can’t open a single lock?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Identify the 10 differences between the two given pictures.

Find the smallest sentence with all the English alphabet.

A dying old man wants to divide his entire land between his only two sons. Since his only wish is to treat them as equal as both of them have been too good to him, he wants to divide his land equally between them. The problem is that the land is significantly irregular in shape and thus there is no choice of cutting them into two equal halves.

Can you help him divide the land in a manner that both of his sons will be happy?

What Does this text mean:

important=important

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?