my question is from chapter unitary method and time and work
the weight of 45 books is 9 kg
first what is the weight of 80 books
second how many books will wait 10.8 kg

Dear Student

Weight of 45 books = 9 kg
(i) Weight of 1 book =  9  kg
                                       45
    Weight of 80 books = 80 ×  9    = 16 kg
                                                    45        

(ii) Number of books weighing 9 kg = 45
    Number of books weighing 1 kg =  45  = 5 
                                                                   9
   Number of books weighing 10.8 kg = 10.8 × 5 = 54  

Regards

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