Study the given graph which shows the Target and Actual production of ACs' (in thousands) of a factory over five months and answer the question that follows.

The ratio of the combined target production of ACs from January to April to that of the actual production of ACs from March to May is:

13 : 15

Target production of ACs from January to April  :   Actual production of ACs from March to May

 ( 60 + 30 + 80 + 90 )  :  ( 100 + 80 + 120 )

               260              :          300

                13               :           15