If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What Deficiency does the below rebus represent?

VIT_MIN

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Take one out and scratch my head, I am now black but once was red. 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.

What does it mean?