What does does this rebus picture means ?

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

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

How can one talk without saying a single word?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

what does this below rebus represent identXQQQQQME

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?