What work can one never finish?

Count the Triangle in the figure given below:

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Which alphabet letter is a question?

Can you find out the remainder when 3^300 is divided by 5?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Find the next number in the sequence

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

What does does this rebus picture means ?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Can you identify the hidden rebus in the image below?