The following table shows the number of laptops sold from five different stores in a city on five days of a given week.

What is the ratio of the total number of computers sold from store S on Tuesday, Monday and Sunday taken together to that sold from store P on Tuesday, Wednesday and Thursday taken together?

20 : 19

Number of computers sold from S  on Tuesday, Monday and Sunday  :   Number of computers sold from P on Tuesday, Wednesday and Thursday

 ( 78 + 74 + 68 )  :  (  49 + 70 + 90 )

         220            :           209

          20             :            19