split - 8th grade

mathhelp24

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It takes 20 minutes to cut a log into 5 equally-sized pieces. How long will it take cut a similar log into 3 equally-sized pieces?

I tried a proportion 5/20 = 3/x. I solved the proportion and got x = 12 minutes. Am I right?
 

Subhotosh Khan

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mathhelp24 said:
It takes 20 minutes to cut a log into 5 equally-sized pieces. How long will it take cut a similar log into 3 equally-sized pieces?

I tried a proportion 5/20 = 3/x. I solved the proportion and got x = 12 minutes. Am I right?
To cut a log into 5 equal pieces you need to have 4 cuts. ? each cut takes 5 minutes.

To cut a log into 3 equal pieces you need to have 2 cuts. ? We need 10 minutes to cut a log into 3 equally sized pieces.
 
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