2 3/4 - 1 5/8 =

a concet promoter puchases 2 3/4 pages of ads. when one of the concert is cancelled., the promoter cancels 1 5/8 pages of ads. how much advertising space is the concert promoter actually using?
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You need to change 2 3/4 into x/8.  Multiply 4 x 2 and add 3. This gives you 11/4. Next change the 4 to an 8. 4 goes into 8 two times, two times 11 = 22.  This means 22/8. Now subtract 22/8 - 15/8 and you get 7/8.
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