bert is twice as old as cheng five yrs ago the sum of thier ages was 26 . how old is bert?

Answer 1

b = 2c
(b-5)+(c-5)=26
2c+c=36
c=12

So, bert is 24

Answer 2

alex and bert are friends and the sum of their ages is 60, nine years ago, alex twice as old as bert. how old is each