Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

Solve the mathematical equation in the picture below.

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?