Question

please explain the answer with answering the question.
answer the question and image.
please answer the questions then only if you understand the whole question.

and remember to explain the answer to me if you don't explain I will do not make as brainliest.
answer Q8.

Answer 1

Given,
Weight of 72 books=9 kg
We need to find the weight of 40 such books so..
IF 72 books weighs=9kg
Then, 1 book weighs=9/72
Then,40 books weighs=9/72×40=5kg.

Answer 2

answer is
books =72 weight of 72 books =9kg
1 kg =1000gram
now we will find weight of 1 book I.e;
$\\ 72 \div 9000 = 0.008 \\ whch \: means \: 800gram$
now we will find out the weight of 40 books