----- Maria ' s present age is one - third of her father ' s age . In 6 years time , Maria will be 19 years old . What is her father ' s age now ?
----- A number is multiplied by 2. Then the product is tripled , If the result is 5 . Find the number.
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有無人可以答我呢兩題既數學題?
2007-02-23 7:01 pm
回答 (2)
2007-02-23 7:07 pm
✔ 最佳答案
1.Let her father's present age be X.
From the question , Maria ' s present age will be 1 / 3 X.
6 + 1 / 3 X = 19
1 / 3 X = 13
X = 39
Therefore , her father's present age is 39.
2.
Let the number be Y,
from the question ,
we have :
2Y x 3 = 5
2Y = 5 / 3
Y = 5 / 6
Therefore the number is 5 / 6
2007-02-23 7:05 pm
Maria: aged X, then we have father aged 3X
And X+6=19 => X=13 => 3X=39
so Maria's father is now 39
Let X be the number, we have 3*(2X)=5
=> X=5/6 or x=0.833
And X+6=19 => X=13 => 3X=39
so Maria's father is now 39
Let X be the number, we have 3*(2X)=5
=> X=5/6 or x=0.833
收錄日期: 2021-04-18 20:54:44
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