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17. The present age of a father and his son is 50yrs and 20yrs respectively. How many years ago the product of their ages was 451. ​
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4 votes
17. The present age of a father and his son is 50yrs and 20yrs respectively. How many years ago

the product of their ages was 451. ​

User Yerassyl
by
4.7k points

1 Answer

5 votes

Answer:

9 yrs ago

Explanation:

(50-x)(20-x) = 451

x^2-70x + 1000 = 451

x^2-70x + 549 = 0

(x-9)(x-61) = 0

x = 9 (if it was 61 yrs ago, the father and son both wouldnt be a live)

User Miles D
by
4.9k points
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