MATH DESTROYER Test 7 #4

[Denizen]

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Can anyone explain the methodology behind solving this question? Dr. Romano's answer, from what I can see, involves time / distance and I have never seen that when working d = rt problems.

 

[Roy Williams]

Can anyone explain the methodology behind solving this question? Dr. Romano's answer, from what I can see, involves time / distance and I have never seen that when working d = rt problems.

What's the question?

 

[Denizen]

What's the question?

Hey, thanks for being willing to help. The question is:

If it takes 8 minutes to paint 4/11 of a door, how long will it take to paint the entire door?

 

[THAPA]

4/11 of a door takes = 8 minutes
therefore remaining door (1-4/11) which comes to be 7/11 of a door will take = 8/4/11 X 7/11

which comes out to be 14 minutes
which means 7/11 of a door takes 14 minutes .

therefore total time to finish off the entire door will be 8 minutes + 14 minutes= 22 minutes.
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[Roy Williams]

Hey, thanks for being willing to help. The question is:

If it takes 8 minutes to paint 4/11 of a door, how long will it take to paint the entire door?

Umm yeah not sure what explanation you're looking at but idk how that involves distance. I'd do it a little different than how @THAPA did it. His involves an extra step that will just take up more time for you during the test.

Just set up a proportion. You can do 4/11 of the door in 8 minutes, so that equals the same as being able to do the whole door (11/11) in x minutes.

8 / (4/11) = x / 1

Then just cross multiply to solve for x = 22

Make sense?