Wednesday, December 2, 2009

Just-in time for the alien story

An alien has landed from another planet. He is a scout for his planet. They plan on taking over the earth.

1) David can saw a log into three pieces in 7 min. If he continues sawing at a constant rate, how long will it take him to saw a similar log into six pieces?
-It takes David 7 min to saw a log in 3 pieces, and they want six pieces, so easy, all you have to do is times 7 by 2 and times 3 by 2. Then you have the answer. 7min x 2 = 14 mins, 3logs x 2 = 6 logs and there you have it.It will take him 14 minutes.

2) A small gear turns 18 times in the same time that a large gear turns 4 times, how many times will the large gear turn if the small gear turns 54 times?
54 divided by 18 = 3 , so 3 multiplied by 4 = 12 .
The larger gear will turn 12 times by the time the small gear turns 54 times.

3) Last night 30 cm of snow fell in 6 h. If it continues snowing at the same rate, how long will it take for 45 cm of snow to fall? Determine the answer two different ways.
- First way , find half of 30 , and half of six, easy! 30 divided by 2 = 15 cm , 6 divided by 2 = 3h, add that to what we have and we got , 45 cm in 9 hours.( 30 + 15 = 45 cm , 6 + 3 = 9 hours)
- Second way , Dividing 45 by 30 = 1.5 , then dividing 9 by 6 = 1.5 , so you multiply 30 and 6 , and you get
45 cm, in 9 hours.


Thanks for reading!!! :D


  1. haha nice sribe post justin you should have put examples of the proportion on a ratio table or something to represent it more useful but anyway nice scribe post

  2. good job justin

    your post is well explained...and i like how you answered question no.3--very deatailed--

    could have added a diagram because it helps people a lot


  3. Good Job Justin! I like the picture that you chose.

  4. good job justin, i like how you change the colour of the question to a different one

    you could have spaced out the answer more because it didnt seem interesting to read.


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