Math
posted by Chris on .
This math question i do not get it is Sanjay earns $13.00 each week from his papaer route.He earns $.15 for each daily paper and $.35 for each sunday papaer he delivers. He delivers twice as many daily papers as sunday papers. How many of each type does he deliver each week. What do they mean? Please help this is my Last question

D*.15 + S*.35=13.00
D=2S
find D, and S 
20 sunday papers
40 daily papers