Question

Professor Ma has a stack of 40 essays to grade. By herself, the professor can grade about five essays in two hours. Her teaching assistant, Chen, can grade about seven essays in three hours. About how many hours (t) would it take both of them to grade all 40 essays if they work together?

Answer 1

a. Fill in the blanks in the table below to find the ratios to represent the various essay
grading rates. Then use the ratios to write a rational equation.
Professor Ma’s
Grading Rate +
Chen’s Grading
Rate =
Combined
Grading Rate
___ essays
___hours
+ ___ essays
___hours
= ___ essays
___hours
Equation: _______________________
b. Identify the LCD for the equation. Solve the equation by multiplying both sides by the
LCD. Show all the steps necessary to find the answer. Then write a sentence to
describe what the answer means for this situation.

Answer 2

I figured it out haha. thanks though

Answer 3

whut?

Answer 4

8.27 answer?

Answer 5

I have another question up. plz take a look at it. and yeah i got that.

Answer 6

post it as new

Answer 7

i did