Ten years ago, the ages of father and son was in the ratio 5 : 2 ; at present their total age is 90 years. Find the present age of the son?
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Answer:
30 years
Step-by-step explanation:
Let the ratio be 5x : 2x.
Present ratio = (5x+10) : (2x+10)
According to Question,
5x+10+2x+10 = 90
=> 7x+20 = 90
=> 7x = 90-20
=> 7x = 70
=> x = 10
Hence, present age of son = 20+10 = 30 years
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