A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

How many words can a pen with half refill write?

How many times can you subtract the number two from the number fifty?

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?

Count the Triangle in the figure given below:

John is the son of Jacob.
So,
Jacob is the_____of John's father?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?