Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Find the missing number in the sequence below:

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.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you count the number of quadrilaterals in the picture below?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

What makes this number unique: 8,549,176,320?

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?

I have branches, but no fruit, trunk or leaves. What am I?