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Math

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Can you please explain this to me.

The problem is 7/16 - 3/20

First I have to find the common denominator which would be 80

How does the 7/16 become 35/80 (where does the 35 come from)
How does the 3/20 become a 12/80 (Where does the 12 come from)

35/80 minus 12/80

answer 23/80

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