A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Solve this riddle by finding the odd one out from the rest.

Take away the whole and some still remain. What is it?