Question. There are 24 students in the class. One-third had their school portraits taken before lunch. After lunch, but before gym class, 10 additional students had their portraits taken. After gym class, how many students have not yet had their picture taken?
Answer. 6
What step-by-step reasoning justifies that answer?
Reasoning: Before lunch, 24 / 3 = 8 students were photographed. Then 8 + 10 = 18 have been photographed by gym class. So 24 - 18 = 6 remain.