Question

Vicki puts 10 books on a shelf.

The 10 books take up 28 centimeters.
What is the mean (average) thickness of her books?
= 2.8 cm
The shelf is 120 centimeters long.
Vicki fills the shelf with a mixture of books like the first ten books.
Estimate how many books she can get on the 120 cm shelf.
Please show your working out.
Thanx

Answer 1

`the\ mean\ hickness\ of\ Vicki's\ books= (28\ cm)/(10) =2.8\ cm\\\\28\ cm\ \rightarrow\ 10\ boocks\\120\ cm\ \rightarrow\ x\\\\x= (120\cdot 10)/(28) \approx42.9\\\\Ans.\ Vicki\ can\ put\ 42\ books.`