Answer:
         Student                                                            Hours worked
              April.                                                                  
         Debbie.                                                                   
         Richard.                                                                   
Step-by-step explanation:
Some data's were missing so we have attached the complete information in the attachment.
Given:
Number of Hours Carl worked on Math project = 
  can be Rewritten as
 can be Rewritten as 
Number of Hours Carl worked on Math project = 
Number of Hours Sonia worked on Math project = 
  can be rewritten as
 can be rewritten as 
Number of Hours Sonia worked on Math project = 
Number of Hours Tony worked on Math project = 
 can be rewritten as
 can be rewritten as 
Number of Hours Tony worked on Math project = 
Now Given:
April worked  times as long on her math project as did Carl.
 times as long on her math project as did Carl. 
  can be Rewritten as
  can be Rewritten as 
Number of Hours April worked on math project =  
  Number of Hours Carl worked on Math project
 Number of Hours Carl worked on Math project
Number of Hours April worked on math project = 
Also Given:
Debbie worked  times as long as Sonia.
 times as long as Sonia.
 can be Rewritten as
  can be Rewritten as  .
.
Number of Hours Debbie worked on math project =  
  Number of Hours Sonia worked on Math project
 Number of Hours Sonia worked on Math project
Number of Hours Debbie worked on math project = 
Also Given:
Richard worked  times as long as tony.
 times as long as tony.
 can be Rewritten as
 can be Rewritten as 
Number of Hours Richard worked on math project =  
  Number of Hours Tony worked on Math project
 Number of Hours Tony worked on Math project
Number of Hours Debbie worked on math project = 
Hence We will match each student with number of hours she worked.
         Student                                                            Hours worked
              April.                                                                  
         Debbie.                                                                   
         Richard.                                                                   