SOLUTION: mary who is 16 years old,is four times as old as her brother.how old will mary be when she is twice as old as her brother.?

Question 454670: mary who is 16 years old,is four times as old as her brother.how old will mary be when she is twice as old as her brother.?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
mary who is 16 years old,is four times as old as her brother.how old will mary be when she is twice as old as her brother.?
---
m = 16 yrs
b = 4 yrs
----
Equation:
Solve: 16+x = 2(4+x)
16+x = 8+2x
x = 8
---
Mary will be 16+8 = 24 yrs.
Brother will be 4+8 = 12 yrs.
============================
Cheers,
Stan H.
RELATED QUESTIONS
Mary, who is 16 years old, is four times as old as her brother. How old will Mary be when (answered by flame8855)

Mary, who is 16 years old, is four times as old as her brother. How old will Mary be when (answered by Alan3354)

Mary, who is sixteen years old, is four times as old as her brother. How old will Mary be (answered by feliz1965,Fals)

Mary, who is sixteen years old, is four times as old as her brother. How old will Mary be (answered by josgarithmetic,lwsshak3,MathTherapy)

Mary, who is sixteen years old, is four times as old as her brother. How old will Mary be (answered by Timnewman,macston,MathTherapy)

Mary is sixteen years old and is 4 times as old as her brother. How old will Mary be when (answered by Alan3354)

Mary is 3 times as old as her brother John. In 5 years, Mary will be twice as old as... (answered by richwmiller)

Mary is 5 times as old as her brother Jim. She will be twice as old in six years. How... (answered by Alan3354)

If Mary is 16,and she is 4xs old than her brother,then how old will mary be when she is... (answered by JulietG)