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Alja [10]
2 years ago
15

17. The present age of a father and his son is 50yrs and 20yrs respectively. How many years ago

Mathematics
1 answer:
jasenka [17]2 years ago
3 0

Answer:

9 yrs ago

Step-by-step 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)

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