Carmen is 15% lighter than Mary and Tomas is 25% heavier than Carmen.
Between Mary and Tomas, who is heavier? By what percentage?
我的數學題唔識?
2008-09-13 10:30 pm
回答 (2)
2008-09-13 10:34 pm
✔ 最佳答案
Thomas is heavier than Mary for 10%. 
2008-09-13 11:47 pm
Let the weight of Carmen, Mary and Tomas be C, M and T respectively.
M (1-15%) = C ------(1)
C (1+25%) =T ------(2)
From(1):
M = C / (1-15%)
M = (20/17)C
From(2):
T = (1+25%)
T = (5/4)C
Then T > M
That Tomas is heavier than Mary.
M (1-15%) = C ------(1)
C (1+25%) =T ------(2)
From(1):
M = C / (1-15%)
M = (20/17)C
From(2):
T = (1+25%)
T = (5/4)C
Then T > M
That Tomas is heavier than Mary.
收錄日期: 2021-04-13 16:04:22
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