Solution:

2519

The number has to end in 9.
Looked brute force for small numbers.
59 and 119 were promising, but no cigar.

Then looked for agreement among
39 + multiples of 40,
69 + multiples of 70 and
89 + multiples of 90
Smallest one was 2519.

Solution:

It is an open ground right? You can just throw the ball in air and it will be brought back to your hand automatically by the gravity.

Solution:

This is because I have three quarters, four dimes and four pennies contributing to $1.19. But in no way I can pay a dollar exactly.

Solution:

You will know what to do by looking at the picture. This was fun right? Now go ask your friends to do it.

Solution:

I am Stamp.

Solution:

Whenever you come across such a question, keep in mind that you have to always start from the last. Otherwise you will always find yourself jumbled up with the things. We have to find the letter between the letter two to the left of C and letter to the immediate of F. Thus we have to find the letter between A and G. Now the letter that lies in the exact middle will be D. Next, we have to go three times right which will lead us to G. One left is next and we will reach F. At last we have to go right twice. Doing that, we will be standing on H.

Thus H is the required letter.

Solution:

10 percent of student study all four subjects.

Solution:

Sun

Solution:

Its day time

Solution:

China