Monday

April 21, 2014

April 21, 2014

Posted by **barbie** on Thursday, September 25, 2008 at 12:08am.

- math -
**Michelle**, Thursday, September 25, 2008 at 12:17amIf Summer grades 25 papers in 30 minutes, and there are 4 half-hours in two hours, multiply 25x4= 100. Summer can grade 100 math papers in 2 hours.

Larry can grade 22 papers in 20 minutes. 60 minutes (one hour) is three times twenty minutes, so two hours is six (doubling the three) multiplied by twenty minutes. So, since 6x20minutes= 2 hours, and he grades 22 papers in 20 minutes, multiply the 22 papers by six for his total. 22x6= 132 papers in 2 hours.

In two hours, Summer grades 100 papers, and Larry grades 132. Therefore, Larry grades 32 papers more in a two hour period of time.

**Related Questions**

math - mr. Rodriguez, a college instructor, can grade his class papers in 3 ...

math - mr. harmen graded 56 papers monday and 87 papers wednesday. how many did ...

math - I need to solve this problem. A teacher can grade 25 papers in 4 hours. ...

statistics - a mathematics professor wishes to analyze the relationship between ...

English - Hello. I've just noticed that I posted my previous question in the ...

math - use : .# x 6 = minutes I did try to do it but came up with numbers like 5...

English - What is the difference in academic papers and memos? How does it ...

statistics - a study of 40 professors showed they spent on average 13.6 minutes ...

Math - What is the independent and dependent variable in the situation. And what...

french - if it is il est huit heures et demie, what time is it? a. 2 hours and ...