簡單數學一題

2007-11-12 4:16 pm

In 15 years a woman's age will be three times her age 15 years ago.What is her present age?

回答 (5)

2007-11-12 5:34 pm

✔ 最佳答案

let her present age be x years old
x+15=3(x-15)
x+15=3x-45
2x=60
x=30
therefore,her present age is 30 years old

參考: myself=]

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2007-11-12 6:24 pm

Let the present age of wman be Wp

Wp+15 = 3 ( Wp - 15)

2Wp = 60

Wp = 30

Therefore, the present age of woman should be 30 year old

參考: Myself

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2007-11-12 5:27 pm

x+15=3(x-15)
x+15=3x-45
15+45=3x-x
60=2x
x=30

therefore, she is now 30 years old

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2007-11-12 4:25 pm

(x+15)/3=x-15
x=30

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2007-11-12 4:24 pm

５０％

求奇答

參考: 自己，，我＝〕

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