SOLUTION: Sipho is 6 years older than Betty. In 3 years time Sipho will be twice as old as Betty. How old is Sipho now?

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Question 1046975: Sipho is 6 years older than Betty. In 3 years time
Sipho will be twice as old as Betty. How old is Sipho
now?
Found 2 solutions by ikleyn, ewatrrr:
Answer by ikleyn(52786)   (Show Source): You can put this solution on YOUR website!
.
Sipho is 6 years older than Betty. In 3 years time
Sipho will be twice as old as Betty. How old is Sipho
now?
~~~~~~~~~~~~~~~~~~~~ 

S = B + 6,         (1)
S + 3 = 2*(B+3).   (2)

Substitute (1) into (2). You will get

(B + 6) + 3 = 2*(B+3),  or

B + 9 = 2B + 6,   or

9-6 = 2b - b,  or

3 = B.

Answer. Betty is 3 years old now.  Sipho is 9 ears old.

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    - OVERVIEW of lessons on age problems
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Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
Sipho is 6 years older than Betty.
Let x represent Betty's age now. Sipho then is (x+6)
in 3years...Sipho will be twice as old as Betty
(x+6) + 3 = 2(x+3)
3 = x, Betty's age now. Sipho is 9
AND
in three years..
9 + 3 = 2*6 CHECKS Sipho is twice as old as Betty
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