Mr. Jacobs is 4 times as old as his son. Five years ago, he was was 9 times as old as his son. What is Mr. Jacob's age?

1 Answer
Owen Bell
Dec 29, 2015

Mr Jacobs is 32.

Explanation:

Let:

  • "Mr Jacobs' age" = J

  • "Mr Jacobs' son's age" = S

J = 4S
J - 5 = 9(S - 5) = 9S - 45

:. J = 4S = 9S - 40
" " 5S = 40
" " S = 8

J = 4(8)
J = 32

32 - 5 = 9(8 - 5)
27 = 9 * 3 " is TRUE"

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