How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

When we see 2 but call 10?

If 1+9+8=1, what is 2+8+9?

Decode below rebus
D
N
A
T
S , D

A lily pad doubles in size every day. If on the 60th day, the pond is exactly filled with the lily pad, on what day is the pond exactly half covered?