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 equation in the image by looking at the pattern closely.

What does this say?

XLR8

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What is the Surname of Barbie Doll?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?