Dustin is two years older than Jessica. In three years the sum of their ages will be 50 how old is Dustin now?

Answer 1

We translate this into algebra.

d = 2 + j

3+d+3+j=50

We rearrange this to:

d+j=44

We substitute the first sentence's value for d into the second sentence.

(j+2)+j=44

2j+2=44

2j=42

j=21

So, Dustin is 23