Working out the weight

This task is about working out the total weight of a number of objects.
illustration: bag of sugar
a)
A box contains 24 bags of sugar. Each bag weighs 0.5 kg. What is the weight of sugar in a full box?
  (A)
(B)
(C)
(D)
(E)
6 kg
12 kg
18 kg
24 kg
None of these. The weight is __________ kg.
 
illustration: open dictionary
b)
A dictionary weighs 1.6 kg. How much will 8 dictionaries weigh?
  (A)
(B)
(C)
(D)
(E)
1.6 kg
2 kg
8 kg
8.8 kg
None of these. The weight is __________ kg.
 
illustration: books
c)
A bookseller wants to send 12 textbooks to a school. Each book weighs 0.75 kg. The heaviest parcel that can be sent in the mail is 3 kg.
How many parcels will the bookseller need to send?
  (A)
(B)
(C)
(D)
(E)
3
4
6
12
None of these. The number of parcels is __________.