Sherry is 25 years younger than her dad. The sum of their ages is 59. How old is Sherry?

Age of Sherry's dad ##=42years## Age of sherry ##=17years##

Let age of Sherry be ##y## and her dad be ##x## So we can write ##x+y=59## ##x-y=25## Adding up both the equations We get ##x+y+x-y=59+25## or ##2x+0=84## or ##2x=84## or ##x=84/2## or ##x=42## Therefore;Age of Sherry's dad ##=42years## Age of sherry ##=42-25=17years##