SOLUTION: Clyve is half the age of his sister Cissy. Five years ago, Clyve was one third of the age of his sister Cissy. How old is he? How old is Cissy?

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Question 1175105: Clyve is half the age of his sister Cissy. Five years ago, Clyve was one third of the age of
his sister Cissy. How old is he? How old is Cissy?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Ages y and 2y;
Clyve and Cissy

y-5=%281%2F3%29%282y-5%29
-
3y-15=2y-5
highlight%28y=10%29----------highlight%282y=20%29

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

Clyve is half the age of his sister Cissy. Five years ago, Clyve was one third of the age of
his sister Cissy. How old is he? How old is Cissy?5
Let Clyve's age be C

Then Cissy's is: 2C

We then get: 2C - 5 = 3(C - 5)

2C - 5 = 3C - 15

2C - 3C = - 15 + 5

- C = - 10

Clyve, or 

You can now find Cissy's age!!