What does below rebus means ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

What has 88 keys?

Count the number of squares in the picture below.

Which point will the car reach to go out?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

You need to move three matchsticks to form three squares. Can you do it?