Question 854358
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Hi,
Let T represent the money Lihui had prior to buying the book and magazine
cost of the story book (2/5)T 
cost of the magazine  (1/3)(2/5)T
Question States***
{{{ (2/5)T + (2/15)T = T - 24}}}
{{{ (6/15)T + (2/15)T = T - 24}}}
      8/15T = T - 24
         24 = (7/15) T 
       (15/7)*24 = T = $51.43
 {{{51.43*.4}}} = $20.57
CHECKING our answer***
  $20.57  + $6.86 = $27.43 = $51.43 - $24 = $27.43
Wish You the Best in your Studies.