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9 May, 18:08

15 arches decreased by 80%

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Answers (2)
  1. 9 May, 20:15
    0
    If it decreases by 80٪, then only 20٪ remains.

    15*20٪=15*20/100=15*0.2=3

    Answer: 3
  2. 9 May, 20:31
    0
    3 arches

    Step-by-step explanation:

    Given

    15 arches decreased by 80%.

    First get 80% of 15 arches

    That's 80%/100% x 15

    0.8 x 15

    12 arches

    Now subtract 12 arches from 15 arches to get the decrease

    Decrease = (15 - 12) arches

    = 3 arches

    Therefore, 80% decrease of 15 inches is equal to 3 arches
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