Question

a pile of 108 identical books weigh 30 kg .find how many books weight 20 kg

Answer 1

108:30=x:20
product of means × product of extremes
30(x) = 108×20
x = 108×20by30
x =36×2
x =72

Answer 2

Answer: The correct answer is 72 books weigh 20 kg where a pile of 108 identical books weigh 30 kg.

Step-by-step explanation:

A pile of 108 identical books weigh 30 kg. So we have to find the weight of 20 books. Since it is given that these books are identical so each book weighs the same.

Now we will use unitary method So we can write a pile of 108 identical books weigh 30 kg as

∵30 kg = 108 books

⇒1 kg =(108/30)books

∴20 kg= (108/30) x20 = 72 books

Hence, 70 books weigh 20 kg where a pile of 108 identical books weigh 30 kg.

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