The age of the father 4 years ago was 7 times the age of his son. At present the father’s age is 4 times that of his son. What are the present ages of the father and the son?
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Answer:
Let the age of the son is x years. Then the age of the father would be 5x years. So at present the age of the son is 9 years and age of father is 45 years.
Step-by-step explanation:
Let the age of son be x.
Thus, age of father is 4x.
After 5 years, their ages will be x+5 and 4x+5 years respectively.
As per the question, we have
4x+5=3(x+5)
⇒4x+5=3x+15
⇒x=10
Age of father will be 4x=4×10=40 years.
Thus when son is 10 years old, father is 40 years.
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