BrainBashers - Easy Puzzles

Puzzle 157

The legendary BrainBashers calendar has had a small problem.

Here is a listing showing the number of days in each month:
January    73
February   83
March      51
April      52
May        31
June       42
July       41
August     63
September  ?

Using the same rules, how many days are in September?

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Puzzle 158

This is a very special sequence and is complete, but what is the missing letter?

T I A V S S A I C ? W I T M L

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Puzzle 159

If:
SAFE + STAY + SOON + SKIP = STOP

then:
PINK + PORE + PUSH + PLOT = ?

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Puzzle 160

A local school teacher wanted to share 703 sweets equally between the pupils.

If there were more than 20, but fewer than 50 pupils, how many sweets did each receive?

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