Posted by **es** on Wednesday, January 9, 2013 at 8:51pm.

A carpenter has several boards of equal length. He cuts 3/5 of each board. After cutting the boards the carpenter noticies he has enough pieces left to make up the same length as 4 origional boards. How many origional boards did he start with?

Someone told me the answer is 10 but I do not understand how they got it. I would like to know how to do the question, so can you explain the steps.

Thanks

- 4th grade math -
**Sam**, Tuesday, February 19, 2013 at 5:04pm
We know each board is divided into 5 pieces, so the total number of pieces can be represented by 5x. Three-fifths of each board is taken away and 2/5 is left. That's 2/5 of the total number of pieces...2/5(5x). The leftover pieces equal the total length of four boards from the original number of boards. The total length of four boards is 4 times 5 pieces. So here's the equation to solve:

2/5(5x)=20 the 5's cancel

2x=20

x=10

He started with 10 boards.

- 4th grade math -
**Anonymous**, Thursday, March 6, 2014 at 8:09pm
1111111111

- 4th grade math -
**Mia**, Friday, March 14, 2014 at 5:07pm
3/5 is taken away 2 is left

- 4th grade math -
**Mia**, Friday, March 14, 2014 at 5:08pm
3/5 is taken away 2 is left that is my answer

from mia igoe

- 4th grade math -
**Jeremiah Estinvil**, Monday, January 26, 2015 at 8:03pm
Okay the answer should be 10 but I don't understand how Sam got 10. I Need an easier way to understand.( :-/ )

- 4th grade math -
**Jeremiah Estinvil**, Monday, January 26, 2015 at 8:04pm
Okay the answer should be 10 but I don't understand how Sam got 10. I Need an easier way to understand.( :-I )

- 4th grade math -
**Anonymous**, Thursday, February 26, 2015 at 4:56pm
10

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