SOLUTION: Doug is 12 years older than his sister Linda. in 4 years ,he will be twice as old as linda. how old is each of them now?
Algebra.Com
Question 104544: Doug is 12 years older than his sister Linda. in 4 years ,he will be twice as old as linda. how old is each of them now?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let d=Doug's age, n=Linda's age
d=n+12...d-n=12 (A)
d+4=2(n+4)...d+4=2n+8...d-2n=4 (B)
.
d-n+12
-d+2n=-4 multiply (B) yimes -1
--------
n=8 add (A) and (B)
Linda is 8 and Doug is 20
in 4 yrs Linda will be 12 and Doug 24.
.
Ed
RELATED QUESTIONS
Greg is 22 years older than his sister Linda. In 3 years, he will be twice as old as... (answered by josgarithmetic)
Doug is 19 years older than his sister Barbara. In 3 years, he will be twice as old as... (answered by stanbon)
Steve is 18 years older than linda. In 8 years, he wil he twice as old as linda. How old... (answered by TimothyLamb)
Ray is 22 years older than his sister Mary. In 12 years, he will be twice as old as... (answered by ikleyn)
Charles is 15 years older than his sister Barbara. In 12 years, he will be twice as old... (answered by Alan3354)
Mark is 10 years older than his sister Sarah. In 4 years, he will be twice as old as... (answered by randyjoseph7)
Mark is 20 years older than his sister michelle. In 4 years he will be
Twice as old as... (answered by josmiceli)
Tony is 20 years older than his sister Danielle. In 16 years he will be twice as old as... (answered by jorel1380)
Jason is 21 years older than his sister Sarah. In 5 years he will be twice as old as... (answered by Maths68)