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AGE PROBLEM.

Rosa is twice as old as Pilar. In 4 years, Rosa's age will be 2 years less than Pilar's age years ago. Find their present ages.


Sagot :

x=Pilar's age
2x=Rosa's age
Linear equation:

x+4=2x+4-2
x+4=2x+2
x=2x+2-4
x=2x-2
x-2x=2x-2-2x
-x=-2
-x/-1=-2/-1
x=2
Pilar's age is 2 years old.
Rosa's age is 4 years old.
Check:
2+4=4+4-2
6=6, True.