Sue is 7 years older than Bob. Three less than twice Bob's is Sue age, find bob and Sue's ages now?
Bob is 10 Sue is 17
Let s = Sue's age
Let b = Bob's age
Sue is 7 years older than Bob so Sue is:
Three less than twice Bob's age:
You need to solve these simultaneously.
Add 3 to both sides:
Subtract b from both sides:
Substitute 10 for b in equation [ 1 ]