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~ :)
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