Question 953074
Adding 2 in the age of son makes his age quarter of his father's age. After 5 years, his father's age become 10 times less than his son's age.find their present ages. 
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Equations:
s + 2 = (1/4)f
f+10 = (1/10)(s+10)
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Modify:
f = 4s + 8
Substitute:
4s+8 + 10 = (1/10)s + 1
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3.9s = -17
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Comment:: That would result in a negative answer.
Please check your posting of the problem.
Cheers,
Stan H.