What does this mathematical rebus means ?

How far can you walk into the woods?

It belongs to you, but other people use it more than you do. What is it?

What does below rebus means ?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

I always drive my customer away.

Who am I?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

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?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?