Dean had 30 toy whistles.
He gave 2 whistles to each of his 6 friends.
How many whistles did Dean have left?

I have 45 cents in nickels.
A nickel weighs 3 grams.
What is the total weight of my nickels?

Evan and Brin are building a wall with blocks.
Evan's wall was 3 blocks high and 6 blocks long.
Brin's wall is 5 blocks high and 4 blocks long.
How many more blocks did Brin use?

Red blocks weigh three times as heavy as blue blocks.
There are 5 red blocks on one side of a seesaw.
How many blue blocks are needed to balance the seesaw?

Alexa has 92 cents in her pocket.
She wants to buy 3 pencils at the school supply store.
Each penil costs 8 cents.
How much money will Amy have left?