# math

posted by .

Al is twice as old as Bill, who is twice as old as Carl. In 10 years, Al will be twice as old as Carl. How old is Al now?

A. 40
B. 20
C. 10
D. 5

• math -

I usually start with the smallest quantity, which here is Carl's age

let Carl's age be x
then Bill is 2x
and Al is 4x

in 10 years:
Carl --- x+10
Bill --- 2x+10
Al ---- 4x + 10

so 4x+10 = 2(x+10)
4x + 10 = 2x + 20
2x = 10
x = 5

So now Al is 4(5) = 20

check:
present ages:
Carl -- 5
Bill --- 10
Al ---- 20

10 years from now:
Al will be 30 and Carl will be 15
Is Al twice as old as Carl ?? YES

• math -

thanks

## Similar Questions

1. ### Math

2x represents that Clyde is twice (2 times) as old as Bonnie. 6 years from now, Clyde will be twice as old as his cousin Bonnie will be then. If Clyde is now 16 years old, how many years old is Bonnie?

3. ### math

i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now?
4. ### 9th grade math word problems

i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now?
5. ### math

Jack is twice as old as he was 5 years ago. His mother was then six times as old as he was. She is now 35 years old. how old is jack?
6. ### math

A. Brad is 12 years older than Sam . If Brad were 8 years older than he is now. he would be twice as old as Sam. How old is Sam now?
7. ### Math

Hello! Here is a question. Marry is twice as old as Jhon and half as old as bob.ln 22 years time bob will be twice as old as John.find marry's age.
8. ### math

rajeev, who is sixteen years old, is four times as old as his sister. How old will Rony be when he is twice as old as his sister?
9. ### analytical math

rony who is sixteen years old, is four times as old as her brother. How old will Mary be when he is twice as old as her brother?
10. ### Math

Three birds have a combined age if 76 years old. One bird is 10 years old. The second is twice as old as the third bird. How old are they?

More Similar Questions