Warm Up It took 6 people 8 days to build a brick wall. The construction crew needed to build an identical wall but needs it done faster. If they add.

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Presentation transcript:

Warm Up It took 6 people 8 days to build a brick wall. The construction crew needed to build an identical wall but needs it done faster. If they add 2 people to the crew, how long will the brick wall take to build now?

Warm Up Practice: A group of 24 college students decided to climb Mt. McKinley. They bought enough food to last 20 days. If 16 additional students joined them, how many days will their food last? 2. A class with 12 children decided to go on an 8 days canoe trip. After they bought just enough food for the trip, 2 adults decided to go on the trip. If they didn’t buy any more food and an adult eats twice as much as a child, how many days will their food last?

Warm Up 3. Luke paints a car in 6 hours while Daniel paints the same car in 3 hours. If they work together, how long will it take them to paint the car?

Warm Up 4. If it takes 4 men 12 days to dig a hold, how long would it take 6 men?

Warm Up 5. A hose takes 15 minutes to fill a swimming pool and the drain empties the pool in 20 minutes. How long will it take to fill the pool if the drain is accidentally left open?

Challenge Warm Up 6. It takes Sara 2 hours to paint a fence and Daniel 4 hours to paint the same fence. How long will it take them to paint the fence if they both work together?

Challenge Warm Up 7. Four hoses are filling a pool. The first hose alone would fill the pool in 4 hours while the second hose takes 6 hours. The third hose and the fourth hose each take 8 hours to fill the pool. How long would it take to fill the pool if all 4 hoses are turned on?

Challenge Warm Up 8. Jay has 8 cats that need to be fed while he is away on a 12 day vacation. If a bag of cat food will feed 3 cats for 15 days, how many bags does he need for his vacation?

Challenge Warm Up 9. A crew of 8 people finished ¼ of a tunnel through a mountain in 30 days. If they added two more workers, how long will it take them to finish the tunnel?

Challenge Warm Up 10. A construction firm was hired to repaint a very large bridge. Written into the contract was a 2 million dollar penalty if the bridge was not completed in 87 days. Their crew of 7 painted 1/3 of the bridge in 45 days so they knew that at that pace, they would never finish the bridge on time. How many more painters should be hired to allow the crew to paint the rest of the bridge in the 42 remaining days?