Today, a bicycle rider rode her bike 5 1/2 miles. yesterday, she rode 6 1/4 miles. the difference in length between the two rides is what fraction of the longer ride?

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.