Respuesta :
6/7 kg are books
if each book weight is 3/7 kg, so two books weight is ( 2 × 3/7 ) kg = 6/7 kg and if each folder weight is 5/21, so three folders weight = ( 3 × 5/21 ) kg = 5/7 kg. Then my bag weight is ( 6/7 + 5/7 ) kg = 11/7 kg.
Books weight of the total weight is 6/7 kg from 11/7 kg,