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April 24, 2014

April 24, 2014

Posted by **17halimk** on Thursday, November 10, 2011 at 8:51am.

- MAth grade 8 -
**Reiny**, Thursday, November 10, 2011 at 9:04amPeter's present age ---> x

Mary's present age ---> (2/3)x

Mary's age two yrs ago = (2/3)x - 2

Peter's age 5 yrs from now = x+5

"Two years ago mary's age was 1/2 of what peter's age will be in 5 years time." ---> (2/3)x - 2 = (1/2)(x + 5)

multiply by 6

4x - 12 = 3x + 15

x = 27

Peter is now 27 and Mary is now 18

check:

Mary's age 2 yrs ago = 16

Peter's age 5 yrs from now = 27+5 = 32

Is 16 one-half of 32 ??

Looks good

- MAth grade 8 -
**17halimk**, Thursday, November 10, 2011 at 9:21amthx

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