Mathematics question help please?

The Smithson Building in the downtown area was resurfaced with 1,200 granite sections each 4 feet x 4 feet. Last year 30 sections needed to be repaired. What percent of the granite squares needed repair?

please help me out if you can explain the solution as well it will be awesome! Thanks

Update:

(1) 2%

(2) 2 1/2%

(3) 20%

(4) 20 1/2%

(5) 25%

5 Answers

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  • Sue
    Lv 7
    9 years ago
    Favorite Answer

    100% always equals the total so for us that is 1200 sections

    when we say 40% it is not a number unless there wer only 100 total then that is 40 out of 100= 40/100

    so to find percents when we don't have a total of 100 we have to divide, say there are 60 out of 80

    that is 60/80= 0.75 which when we convert to percent 0.075 X 100% becomes 75%

    Our problem 30/1200=0.025 and 0.025 X 100% = 2.5%

  • 9 years ago

    Hi, the answer is 25%

    % is based on 100 so 25/100 or 0.025 x 1200 = 30 the total broken or missing peaces...

    0.025 x 1200 =30

    After another day of looking at this 25% is too high...

    The other answers below are correct 2.5% I had the decimal point in the wrong place opps…

    This is simple math I just had to think about it…

    Source(s): base math for % use x or multiply...
  • 9 years ago

    30/(1200/100)=2.5 30/(12), 2*12=24 from 30 leaves 6, 6 is one half of 12, 2 and one half is 2.5

    2) 2 1/2 percent

  • 9 years ago

    percent=30/1200*100=100/40=10/4=5/2=2.5%

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  • 9 years ago

    4x4=16

    16x30=480

    480÷1200= 0.4

    40%

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