Question 1016770: Pls help solve dis equation, d sum of the ages of a father and mother is 81years.if the difference in the age is 9 years, calculate the age of the mother
Answer by ikleyn(52800)   (Show Source):
You can put this solution on YOUR website! .
Pls help solve dis equation, d sum of the ages of a father and mother is 81years.if the difference in the age is 9 years, calculate the age of the mother
--------------------------------------------
f + m = 81, (1)
f - m = 9. (2)
Add these two equations, and you easily find the father's age f = 45.
Then get the mother age m = 36.
If instead of (2) you have
m - f = 9 (2'),
then act correspondingly, and get m = 36, f = 45.
The condition doesn't say which of the two alternatives is really in the place.
|
|
|
