Question

if 84 books weight is 12kg then what is
the weight of 35 such books​

Answer 1

84 books=12 kg

1 book=12/84 kg=1/7 kg

35 books=1/7*35=5kg

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Answer 2

84books = 12kg

1book=?

on cross multiplying

1book=0.14286

for 35 books

35*0.14286=5.0001kg