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October 20, 2014

October 20, 2014

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

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 5:04pmWe 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 8:09pm1111111111

- 4th grade math -
**Mia**, Friday, March 14, 2014 at 5:07pm3/5 is taken away 2 is left

- 4th grade math -
**Mia**, Friday, March 14, 2014 at 5:08pm3/5 is taken away 2 is left that is my answer

from mia igoe

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