What occurs twice in a week, once in a year but never in a day?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

How do you go from 98 to 720 using just one letter?

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

What word is pronounced the same if you take away four of its five letters?

Can you find the hidden animal in the picture below?

Why is a river so rich ?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.