Problem:

Jacob is 4 times the age of Clinton. 8 years ago Jacob was 9 times the age of Clinton. How old are they now and how old were they 8 years ago?

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- Thread starter Drew
- Start date

Problem:

Jacob is 4 times the age of Clinton. 8 years ago Jacob was 9 times the age of Clinton. How old are they now and how old were they 8 years ago?

- j = 4c
- j - 8 = 9(4c - 8)

(4c) - 8 = 36c - 72

Using our equation solver, we get c = 2

Which means j = 4(2) = 8

8 years ago, Jacob was just born. Which means Clinton wasn't even born yet.

So I tried 4c-8=40c-80 in the equation solver and it also came back with C=2 which was the same answer you got before?

oh and my brute force answer was 12-48 and 8 years earlier was 4-40she wrote it down wrong! The 9 should have been a 10.

So I tried 4c-8=40c-80 in the equation solver and it also came back with C=2 which was the same answer you got before?

Jacob is 4 times the age of Clinton. 8 years ago Jacob was 10 times the age of Clinton. How old are they now and how old were they 8 years ago?

- j = 4c
- j - 8 = 10(c - 8)

(4c) - 8 = 10c - 80

Equation solver gives us

8 years ago,

Thank you, I see what I did wrong!

Jacob is 4 times the age of Clinton. 8 years ago Jacob was 10 times the age of Clinton. How old are they now and how old were they 8 years ago?

Substitute (1) into (2)

- j = 4c
- j - 8 = 10(c - 8)

(4c) - 8 = 10c - 80

Equation solver gives usc = 12which means j = 4(12) =48.

8 years ago,j = 40 and c = 4which holds the 10x rule.