Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

I have Rs.50 and I spend it in the way as below.

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

The pound is not a finish.

We are sharing a few instructions below, which you have to use in any suitable order to modify the above sentence such that the end sentence is a scientific fact.

- Eliminate a letter and supplement another in its place.
- Take away one word.
- Remove one letter from one word.
- Get rid of two letters from one word.
- Swap a word with its antonym.

Take away the whole and some still remain. What is it?

Who is that with a neck and no head, two arms and no hands? What is it?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Replace the question mark with the correct number in the below-given picture?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?