Respuesta :

Answer:

It appears that the books have a scale factor for each one, meaning that the 5th book would be 1200g.

To check this regarding the average weight, add the weight of all 5 books together and divide by 5.

(400 + 600 + 800 + 1000 + 1200) / 5 = 800

AnnaMastro

Answer:

the fifth book weighs 1200g

Step-by-step explanation:

(400+600+800+1000+x)/5=800 =>

(2800+x)/5=800 =>

x=(800×5)-2800=>

x=4000-2800=>

x=1200

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