Dwayne has $5.00 kendra has 1/10 as much money as dwayne juan has 1/10 as much money as kendra tom has 10 times as much money as dwayne and ruth as 10 times as much money as tom

To answer this question you need to interpret the ratio of the money correctly. We only know Dwayne money, so it's better to solve the ratio which was related to Dwayne. In this case, it was Kendra or Tom. 

Dwayne money = $5
Kendra money= 1/10 Dwayne money= 1/10 x $5= $0.5
Juan money= 1/10 Kendra money = 1/10 x $0.5= $0.05
Tom money = 10 x Dwayne money = 10 x $5 = $50
Ruth money = 10 x Tom money = 10 x $50= $500

The shelves will hold 270 books in total