Arithmetic and pre-algebra Ratios, proportions, units and rates Rates Usain Bolt's Average Speed Finding Unit Rates Finding Unit Prices Rate problems 0.5 Rate problems 1 Rate problems 2 Finding Unit Prices Finding Unit Prices Back Finding Unit Prices ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. Miranda's Maid Service charges $280 to clean 8 offices. What is the company's price for cleaning a single office? So they charge $280 to clean 8 offices. So it's $280 per every 8 offices. And then we can simplify this. We could see, well, are both of them divisible by a common factor? And this one looks like it is divisible by 8. 200 is divisible by 8, and then 80 is divisible by 8 as well. So let's divide both the numerator and the denominator by 8. And if we do that, 8 goes into 28 three times. 3 times 8 is 24. Subtract. You have 4 left over. 8 minus 4 is 4. Bring down this 0. 8 goes into 40 exactly five times. 5 times 8 is 40, and you have no remainder. So when you divide 280 by 8, you get 35. And if you divide 8 by 8, you get 1. So this rate simplifies to, this price per office, I guess we could call it, simplifies to $35 for every 1 office, which we could also write as 35 over 1 dollars per office, which is the exact same thing as $35 per office. And we're done. That is the company's price for cleaning a single office: $35. Questions Tips & Feedback Be specific, and indicate a time in the video: At 5:31, how is the moon large enough to block the sun? Isn't the sun way larger? Have something that's not a question about this content? Post a tip or feedback General discussion about the site Report a technical problem with the site Request a video or feature This discussion area is not meant for answering homework questions. Formatting tips Cancel or ( total) Share a tip When naming a variable, it is okay to use most letters, but some are reserved, like 'e', which represents the value 2.7831... Suggest a fix At 2:33, Sal says "double bonds" but should say "single bonds." Have something that's not a tip or feedback about this content? Ask a question General discussion about the site Report a technical problem with the site Request a video or feature This discussion area is not meant for answering homework questions. Formatting tips Cancel or Discuss the site For general discussions about Khan Academy, visit our Reddit discussion page. Flag inappropriate posts Here are posts to avoid making. If you do encounter them, flag them for attention from our Guardians. abuse disrespectful or offensive an advertisement not helpful low quality not about the video topic soliciting votes or seeking badges a homework question a duplicate answer repeatedly making the same post wrong category a tip or feedback in Questions a question in Tips & Feedback an answer that should be its own question about the site a question about Khan Academy (Visit our FAQ) a post about badges a technical problem with the site (Report a problem) a request for videos or features
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