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A metal washer has an external diameter of 2cm and an internal diameter of 1cm.

 

a. How many washers can be cut from a sheet of steel 3m by 1m?

b. If the metal left over was remelted and cast into a sheet of the same thickness and width 1m, how many additional washers could be cut?

 

The answer to "a" is 7500 washers.

I am having a problem with "b." The answer to that is 3050 but I do not know the process and can't fully understand the question. Please provide a detailed explanation of the process and question. (The answer has to be 3050)

 

Note the units. They can be tricky.

Thanks! :)

 Jun 25, 2018

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