I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Solve the counting riddle by identifying the number of triangles in the given picture.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

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

When monkey rotate the gear, which mark will be hit 1 or 2 ?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

There is something which is always coming but never arrives?