Father 4510

The father is 48 years old, and the son is 21. How many years ago was the father ten times older than the son?

Correct answer:

x =  18

Step-by-step explanation:

48-x = 10(21-x)

48-x = 10·(21-x)

9x = 162

x = 162/9 = 18

x = 18

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