mathz 急! only 1 question!

2008-01-06 12:40 am

Mary is 20% heavier than Sam .by how much per cent is Sam lighter than Mary?

回答 (4)

2008-01-06 12:50 am

✔ 最佳答案

1/(1+20%)

=1/1.2

=0.8333...

=83.33% to 2 d.p

1-83.33%

=16.67%

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2008-01-06 12:54 am

suppose Sam is 100kg
then Mary weighs = 100*(1+20%)=120kg

So The percentage
= 1-(100/120*100%)
=1-83.3333%
=16 2/3%

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2008-01-06 12:53 am

Sam lighter than Mary20%
題解:瑪莉重過森20%,問森輕過瑪莉幾多百分點?
因為:瑪莉重過森=森輕過瑪莉
所以:瑪莉重過森20%=森輕過瑪莉20%

參考: 自己

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2008-01-06 12:45 am

1 - 20%
= 100% - 20%
= 80%

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