Posted by **HELP!!!** on Saturday, April 30, 2011 at 2:43am.

Dominic was 8 years old when his sister was born. Now the sum of their ages i 56. How old is Dominic now?

- Math -
**Jai**, Saturday, April 30, 2011 at 3:51am
from the first statement, it implies that Dominic is 8 years older than his sister.

first we represent unknowns using variables:

let x = sister's age

let x+8 = Dominic's age

since the sum of their ages is 56,

x + (x + 8) = 56

then we solve for x:

2x + 8 = 56

2x = 48

x = 24 (sister's age)

x+8 = 32 (Dominic's age)

hope this helps~ :)

## Answer This Question

## Related Questions

- math - Mr.Edwards is now three times as old as his daughter, in 15 years' time ...
- math - A. A woman was 30 years old when her daughter was born.Her age is now 6 ...
- math - Four years from now Emily will be as old as Cathy is now. Seven years ago...
- MATH - 1. A father is three times as old as his son. Five years ago the sum of ...
- math - i never can do word problems....please help... i got 7 of them.....these ...
- 9th grade math word problems - i never can do word problems....please help... i ...
- Math - 2x represents that Clyde is twice (2 times) as old as Bonnie. 6 years ...
- Algebra II - Sue is three times as old as her sister. In one year from now, ...
- math - A. John is now 10 years older than Marcus. Three times John's age 5 years...
- math - How old are they? I found this question online. Please help me understand...

More Related Questions