1.

112 identical books have a mass 20kg find the mass of 140 such books the number of such book that have a mass of 20kg

Answer»

Answer:

to get this, we just use ratio and proportion:

LET X = weight of 150 books.

108 books : 30 KG = 150 books : x kg

we can THUS rewrite this as

108/30 = 150/x

3.6 = 150/x

x = 150/3.6

x = 41.67 kg

(B) we also use ratio and proportion here:

let y = number of books that has weight of 20 kg.

108 books : 30 kg = y books : 20 kg

thus,

108/30 = y/20

3.6 = y/20

y = 3.6*20

y = 72 books

hope this helps~ :)


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