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March 3, 2015

Posted by **joy** on Wednesday, July 28, 2010 at 9:09pm.

- math -
**Reiny**, Wednesday, July 28, 2010 at 9:18pmPresent age:

Perla --- x

Orly ---- 3x+4

four yrs ago

perla -- x-4

orly ---- 3x+4 - 4 or 3x

"Four years ago, Orly was four times as old as Perla was then"

---> 3x = 4(x-4)

3x = 4x - 16

x = 16

So Perla is 16 and Orla is 52

check:

now: Perla = 16, Orla = 52

4 yrs ago : Perla = 12, Orla = 48

Is 48 four times 12 ? YEA

- math -
**joy**, Wednesday, July 28, 2010 at 9:54pmReiny i have some question if Perla is x=16 how about the solution for Orly

- math -
**Reiny**, Wednesday, July 28, 2010 at 10:29pmAs I stated above, Orla is 52

I had defined his age as 3x+4, and 2(16)+4 = 52

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