Adding and Subtracting fractions with Ninja Turtles

The Ninja Turtles defeated 3/10 of New York's bad guys on Monday and 1/4 of New York's bad guys on Tuesday. How many bad guys did they defeat in all?

Splinter spent 4 1/6 hours training Donatello and 2 3/4 hours training Raphael. How many hours were spent on training Donatello and Raphael?

Michelangelo ate 7/8 of a pizza. Leonardo ate 2/3 of a pizza. How much more pizza did Michelangelo eat?

Leonardo bought 4/5 gallons of blue paint. Michelangelo bought 2/3 gallons of orange paint. How much paint did the Ninja Turtles buy in all?

1/2 of the students in my class like Leonardo the best. 2/9 of my students like Donatello the best. How many more students like Leonardo than Donatello?