Answer=15:39
Step1(find the number of right handed batters)
Left-handed batters=45
5 45
__=___
8 x
Cross multiply
5x=360
divide both sides by 5
x=72
Right-handed batters=72
Step 2 (find the number of total batters)
total batters=45+72=117
Step3 (find the ratio of left handed batters to total batters)
Left-handed batters to total batters= 45/117
45/117 can be shortened to 15/39
Answer=15:39