Question

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. ​

Answer 1

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)