SOLUTION: seven years ago B was twice as young as A,when A was3 years younger than B is now. How old is A now?

Question 529992: seven years ago B was twice as young as A,when A was3 years younger than B is now. How old is A now?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = A's age now
Let = B's age now
= A's age 7 years ago
= B's age 7 years ago
---------------------------
given:
7 years ago, A was 3 years younger than B is now
(1)
7 years ago, B was twice as young as A ( half A's age )
(2)
---------------------
(2)
(2)
(2)
and
(1)
(1)
(1)
(1)
Substitute (1) into (2)
(2)
(2)
(2)
(2)
A is 15
check:
(1)
(1)
(1)
(2)
(2)
(2)
(2)
OK
RELATED QUESTIONS
Chris is 3 years older than Beth. Seven years from now she will be twice as old as Beth... (answered by tutmath)

Amy is 4 years younger than Carlos. Seven years ago Carlos was twice as old as Amy was... (answered by stanbon)

A is twice as old as B,three years ago,A was three times as old as B,how old is A... (answered by richwmiller)

A is now 9 years older than B. In 10 years, A will be twice as old as B was 10 years ago. (answered by richwmiller)

anna is seven years younger than Bradi three years from now Anna will be twice as old as... (answered by Maths68)

1. A man is now 42 years old and his friend is 33 years old. How many years ago was the... (answered by ankor@dixie-net.com,Mathtut)

Gil is twice as old as Bill was, when Gil was 8 years younger than Bill is now. The sum... (answered by Edwin McCravy)

A is now 9 years older than b. In 10 years,A will be twice as old as 2 was 10 yrs ago.... (answered by skartikey)

How to solve this? Chris is 3 years older than Beth. Seven years from now she will be... (answered by lwsshak3)