SOLUTION: Mary is 43. Her son is 7. How many years will he be 1/3 Mary's age?

Question 406884: Mary is 43. Her son is 7. How many years will he be 1/3 Mary's age?
Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
Let x= number of years until Mary's son is 1/3 Mary's age
So, our equation to solve then is:
(7+x)/(43+x)=1/3 cross multiply or multiply each side by 3(43+x)
3(7+x)=43+x
21+3x=43+x subtract x and also 21 from each side
21-21+3x-x=43-21+x-x collect like terms
2x=22
x=11 yrs---number of years until Mary's son is 1/3 Mary's age
CK
(7+11)/(43+11)=1/3
18/54=1/3
1/3=1/3
Hope this helps--ptaylor
RELATED QUESTIONS
Mary�s age is 8years and her father is 43 years, In how many year�s time will the father... (answered by ankor@dixie-net.com)

Please help me solve this word problem, thanks: Mary is 3 times as old as her son.... (answered by mananth)

Mary is 41 years and her son is 5 years old. after x years, her son will be half her... (answered by Alan3354)

Mary is thress times as old as her son. in 12 years, marys age will be 1 year less than... (answered by zephyr)

Mary's mother is 3 times as old as Mary, 4 years ago Mary was 1/4 her mothers age. How... (answered by ewatrrr)

Currently mary is three years older than sharon half of Sharon's age. In twelve years,... (answered by josgarithmetic,greenestamps)

Mary is 12 years old. Robin her mother is 35. a. Write an expression for the person�s... (answered by Mathtut)

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 12 years and her father is 42 years old how old will her father be we he is... (answered by macston,stanbon)