find their present ages
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Let the age of son be x
Then ..... The age of his father would be 7x
After 4 years ...... Age of son = (x+ 4 ) years ..... Age of father would be (7x+4 ) years ....
According to the question ......
7x +4 = 4(x+4)
7x + 4 = 4x + 16
7x - 4x = 16 - 4
3x = 12
x = 4
7x = 4×7 = 24
Therefore the ages of the man and his son are ..... 28 years and 4 years .....
The second question isn't clear ......
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