Question

If the weight of 90 books is 9 kg so how many books will weigh 8 kg
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Answer 1

Answer:

80

Step-by-step explanation:

90 books= 9kg

x books =8kg

cross multiplication:

90x8/9

=720/9

=80

Answer 2

Answer:

80 books

Step-by-step explanation:

According to the information provided in the question it is given as

weight of 90 books = 9 kg

We need to find that how many books have weight 8 kg

Here

90 books = 9 kg

x books = 8 kg

Now by making simple equation we get the answer

A proportion is a statement that two ratios are equal. ... In a proportion, the product of the means equals the product of the extremes.

$90= 9\\x = 8$

$9x = 90\times 8\\9x = 720\\x= \frac{720}{9} \\x= 80$

Hence there are  80 books having weight 8 kg