VTMO 2026 - Grade 2 - Semifinal - SET 5 - Self-study Question 6

Hạnh and Tùng buy the same kind of pencil. Hạnh buys 4 pencils and Tùng buys 6. Each pays with a 100-thousand-đồng note, and together they receive 120 thousand đồng in change. How many thousand đồng does Hạnh receive in change?