Can you fill the blank with the correct number?

6 30 870 756030 _____

What do you think with the below Picture ?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

What is black when you buy it, red when you use it, and gray when you throw it away?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

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

Find the next number in the sequence

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

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What can you see in the middle of March and April that you can never see in any other month?