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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