VTMO 2026 - Grade 5 - Semifinal - SET 8 - Self-study Question 23

At Titan’s Mathematics Fun Day, each of four completed challenges earns a symbol: V, T, M or O. Among 200 pupils, 173 earn V, 161 earn T, 145 earn M and 121 earn O. No pupil earns all four. How many earn both V and O?