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 Nice question @LavTheRawkstar 

a) Everyone wearing neither a hat nor a scarf is wearing gloves.
n(H U S)= n(H)+n(S) - n(H n S)
= 60+51-30
=81
n(H' n S') = 130-81 =49

b)26 students are wearing hat and sweater, hence 60 - 26 = 34 students are wearing hat but not scarves.
12 students wear hat, sweater and scarves together.
 So, 30-12=18 students wear sweater and scarves but not sweater.

So no of students wear hat but not scarves and sweater is 34-18 = 16

c) No of students not wearing sweater =130-54 = 76
No of students wear hat or scarves but not sweater = 81-(26+21-12) = 46
No of students not wearing hat, scarves and sweater =76-46 =30

Correct me if I went wrong somewhere!

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