Çözüldü Solving Problems Using One-Variable Equations

If Janet gives half of her money to Bella, who has $80, and Bella has $100 left after spending half of her money, how many dollars does Janet initially have?

A) 160
B) 180
C) 200
D) 220
E) 240

($80 + Janet / 2) / 2 = $100 ⇒ Janet = $240.

Notes:
1. This problem was adapted from a question asked on the Turkish University Entrance Exam (ÖSS) in 1999.
2. Solving the equation is homework for the interested students.