簡單數學一題
2007-11-09 4:51 am
A man is 36 years old than his son. In 10 years' time his son's age plus half his age will be 42 years. How old is he now?
回答 (4)
2007-11-09 5:02 am
✔ 最佳答案
he is x old nowhis son is x - 36 old now
如果 10 years' time = 10 年後,
x - 36 + 10 + (x + 10)/2 = 42
x = 42
如果 10 years' time = 10 年前,
x - 36 - 10 + (x - 10)/2 = 42
x = 62
2007-11-10 1:28 am
A-B=36
A=36+B
10B+A/2=42
10B+(36+B)=42
11B+36=42
11B=6
B=6YR/11
B=0.545454......YR
A=36+B
A=36.54545454....YRS OLD
I THK HE IS 36YEARS OLD
A=36+B
10B+A/2=42
10B+(36+B)=42
11B+36=42
11B=6
B=6YR/11
B=0.545454......YR
A=36+B
A=36.54545454....YRS OLD
I THK HE IS 36YEARS OLD
參考: ME
2007-11-09 5:07 am
he is x old now
his son is x - 36 old now
如果 10 years' time = 10 年後,
x - 36 + 10 + (x + 10)/2 = 42
x = 42
如果 10 years' time = 10 年前,
x - 36 - 10 + (x - 10)/2 = 42
x = 62
his son is x - 36 old now
如果 10 years' time = 10 年後,
x - 36 + 10 + (x + 10)/2 = 42
x = 42
如果 10 years' time = 10 年前,
x - 36 - 10 + (x - 10)/2 = 42
x = 62
2007-11-09 5:05 am
x-36=42-10-x/2
收錄日期: 2021-04-20 12:09:33
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