SOLUTION: The sum of Ann and Fred's age is 28. In seven years time Ann will be twice as old as Fred. How old are they now? I need to solve this using simultaneous equations.

Algebra.Com
Question 1079257: The sum of Ann and Fred's age is 28. In seven years time Ann will be twice as old as Fred. How old are they now?
I need to solve this using simultaneous equations.
Found 2 solutions by htmentor, Edwin McCravy:
Answer by htmentor(1343)   (Show Source): You can put this solution on YOUR website!
A= Ann's age
F= Fred's age
A + F = 28 [sum of their ages]
A + 7 = 2(F + 7) [Ann will be twice Fred's age in 7 years]
So we have two equations and two unknowns
A + F = 28 -> A = 28 - F
substitute this value into the other equation:
28 - F + 7 = 2F + 14
Solve for F:
3F = 21 -> F = 7
Therefore A = 21
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!


The other tutor has already done it for you, so all you have to do is

copy it, turn it in, get credit for work that is not yours, and learn

nothing.    



 

RELATED QUESTIONS


Kris is 5 years older than Ann, and in 3 years she will be twice as old as Ann.  How old... (answered by stanbon)

Ann is now seven times as old as Joan. In six years, Ann will be five times as old as... (answered by stanbon)

The sum of anne's amd fred's ages are 28. in 7 years anne will be twice as old as fred.... (answered by TutorDelphia)

Fred is seven years older than Ann . The sum of their ages is 31 . How old is Fred ?  (answered by Alan3354)

Ann is four times as old as Ben and five times as old as Carrie. By the time Carrie is... (answered by ankor@dixie-net.com)

The ages of Ann and Bill now add up to 91. Ann is three times as old as Bill was at the... (answered by jojo14344)

The ages of Ann and Bill now add up to 91. Ann is three times as old as Bill was at the... (answered by ankor@dixie-net.com)

Ann is twice as old as Ben and thrice as old as Carrie. By the time Carrie is twice her... (answered by lwsshak3)

anns age is three times kims in four years from now ann will be twice as old as kim how... (answered by Maths68)