By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

How many triangles are there on the puzzle below?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

Can you count the number of squares in the given picture?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?