Study the bar graph and answer the question.

The ratio of the number of neon lamps having a life of 900 hours or more to the number of lamps having life less than 700 hours is:

8 : 9

Number of lamps with life 900 or more  :  Number of lamps with life less than 700 hours

 ( 70 + 55 + 35 )  :  ( 45 +  60 + 75 )

         160            :       180 

          8              :         9