SCHOLAR LOG: Age difference never changes — it's the bedrock of time! 年龄差永远不变——它是时间的基岩！
CH4: WORD PROBLEMS / 第四章：应用题
年龄问题
AGE PROBLEMS
Master the invariant law of age differences. The gap between two people's ages never changes — use this bedrock principle to solve any age problem.
schedule
ESTIMATED TIME
15 MINS
workspace_premium
REWARD POTENTIAL
+500 XP
stairs
DIFFICULTY LEVEL
INTERMEDIATE