Unit rate for $32.05 for 15 gal

Somone me i want to know what 18 hours out of 24 hours in a fraction

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class