Martha is 15 years older than bob. the sum of their ages is 68. how old are they

Answer 1

Let Bob's age = x,
then Martha = x+15

x + (x+15) = 68

Solve for x, then x+15.

Answer 2

Bob's age= x
Martha's age= 15

X+(x+15)=68
68-15=53
.
. . 53+15=68

So Bobs age is 53 plus by Martha's
age which is 15 total sum of their age is 68