Why is the Hole below a Lock?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Can you name an animal whose killing cannot be performed without spilling your own blood?

What does this Rebus Picture means ?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Count the number of lines in the image below ?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Decode below rebus
D
N
A
T
S , D