Nancy is 11 years old. She has friends who are 13, 11, 9 and 8 years old. How much older than Nancy would someone be if all the ages were added together?

Answer 1

total of the other ages - nancy's age =

(13+11+9+8) - 11 =

13+11+9+8 - 11 = 13 + 9 + 8 <--- 11 cancels out

= 30