The difference between the present ages of Peter and his son is 30. Four years
ago, Peter was 3 times as old as his son. How old is Peter now?
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F.1英中數學
2012-01-28 2:25 am
回答 (2)
2012-01-28 4:49 am
✔ 最佳答案
Let Peter x years old now , then his son is x - 30 years old.Four years ago,Peter was x - 4 years old while his son is x - 30 - 4 = x - 34 years old
and Peter was 3 times as old as his son :
x - 4 = 3 (x - 34)x - 4 = 3x - 1022x = 98x = 49
Peter is 49 years old now.
2012-01-31 4:07 am
Let x years old be Peter's age,
(x - 30) years old be his son's age.x - 4 = 3 (x-30-4)x - 4 = 3x - 1022x = 98x = 49
Therefore, Peter is 49 years old now.
(x - 30) years old be his son's age.x - 4 = 3 (x-30-4)x - 4 = 3x - 1022x = 98x = 49
Therefore, Peter is 49 years old now.
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