Of 450 lunches old at school on Thursday, 40% were hamburgers and the rest were pizza. How many  more pizza lunches were sold than hamburgers?

You have a class called "Marshall Middle"? That's very unusual. This sounds more like math to me.

http://www.mathsisfun.com/percentage.html

1125

To find the number of pizza lunches sold, we'll first calculate the number of hamburgers sold.

We know that 40% of the lunches were hamburgers. To find this, we can multiply the total number of lunches by 40%:

40% of 450 lunches = 0.40 * 450 = 180 hamburgers

Now, we can find the number of pizza lunches:

Total lunches - Hamburgers = Pizza lunches
450 - 180 = 270 pizza lunches

To determine how many more pizza lunches were sold than hamburgers, we subtract the number of hamburgers from the number of pizza lunches:

Pizza lunches - Hamburgers = Difference
270 - 180 = 90

So, there were 90 more pizza lunches sold than hamburgers.