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October 21, 2014

October 21, 2014

Posted by **Mathematics** on Wednesday, January 11, 2012 at 8:35am.

- Kathie -
**Reiny**, Wednesday, January 11, 2012 at 8:50amson's present age: x

father's present age : y

4 yrs from now:

son : x+4

father : y+4

y+4 = 3(x+4)

y = 3x + 8

6 yrs ago:

son : x-6

father: y-6

y - 6 = 7(x-6)

y = 7x -36

so 7x -36 =3x+8

4x = 44

x = 11

y = 3(11)+8 = 41

**The son is now 11 and the father is now 41**

check:

4 yrs from now: son-- 15, father 45

3 times as old? yes

6 yrs ago: son -- 5, father 35

7 times as old? yes

all is good

- Kathie -
**Mathematics**, Wednesday, January 11, 2012 at 10:01amThank you very much Reiny!

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