You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

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?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

I am white when I am dirty, and black when I am clean. What am I?

Spot 5 differences in two Christmas tree below:

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What number should come in place of the question mark below?