VTMO 2026 - Grade 5 - Semifinal - SET 12 - Self-study Question 4

An initially has 40 sweets. First, Bình gives An 20 sweets; then An gives Bình 30 sweets. Finally, Bình gives An one fifth of Bình’s sweets, and the two children then have equal amounts. How many sweets did Bình have initially?