Jennifer is 4 years older than her sister, rebecca their ages sum to 28. How old are each of the sisters

Answer 1

Jennifer is 4 years older than Rebeca means: J=4+R

Their age is 28 means J+R=28

or 4+R+R=28

Solve for R we have 4+2R=28

or

2R=24

R=12

J=4+R=16