What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

How many triangles can you find in this given picture?

Replace The Question Mark Below With the Correct Number.

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

Before Mount Everest was discovered, what was the highest mountain in the world?

What does below chemistry rebus means?

Find the next number in the following series:
6, 14, 26, 98, __?