There were 24 sailboats and 25 motor boats in the harbor.
13 boats sailed out to sea.
How many boats remained in the harbor?

Monica's father cooked 20 hamburgers.
Kurt's dad cooked 38 hamburgers.
45 hamburgers were eaten.
How many hamburgers were left?

The Happy Habitat had 21 koala bears.
They had 15 panda bears.
11 bears were moved to another zoo.
How many bears were left?

Sparky had 28 balls.
He buried 10 in the garden and 6 behind the garage.
How many balls did Sparky have left?

Brett made a bowl of Lucky Letters cereal.
He counted 57 consonants and 22 vowels.
After eating some cereal, he counted only 35 letters.
How many letters did Brett eat?