What is the word or phrase?

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

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Can you solve the below geography rebus by decoding the below rebus ?

How far can you walk into the woods?

Can you find out who is the kidnapper in below Picture and why, Explain ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?