Question 480473
Let Norie's age : x

then Rizza's age :x+1

Eight years ago....
Norie's age : x-8
Rizza's age :x+1-8 

Sum of their ages 8 years ago
(x-8)+(x+1-8)
=x-8+x+1-8
=2x-15

Also given that the sum of their ages was equal to Rizza's age ten years from now, which leads to
2x-15=x+1+10
2x-15=x+11
Transposing similar terms leads to....
2x-x=11+15
So x=26 which is Norie's age 
and Rizza's age would be 26+1=27

Ans: Norie and Rizza are 26 and 27 years old now