Daily Math Puzzle: 2026-05-15

The Elder Elf of the Whispering Woods speaks in riddles, challenging adventurers to find the 'Echo' of his words. He reveals his method with these examples: If he says **LISTEN**, its Echo is **SILENT**. If he says **EARTH**, its Echo is **HEART**. Following his wisdom, what is the 'Echo' of the word **MAGIC**?

Detective Inspector Anya Sharma is investigating a daring jewel heist. The thieves disabled the museum's primary security system at exactly 7:00 PM. A witness, located 100 km away on the only escape route, saw the getaway car speed past their house at exactly 8:15 PM. The car was later found abandoned 60 km further down the same road, at exactly 9:00 PM, with its engine still warm. Assuming the thieves drove at a constant speed from the museum to where they abandoned the car, what is the *earliest* possible time the getaway car could have left the museum?

You are the commander of a spaceship that is running low on fuel. You have three fuel tanks, each with a different capacity: Tank A can hold 1000 L, Tank B can hold 2000 L, and Tank C can hold 3000 L. The fuel gauges are broken, and you only know that one tank is full, one tank is half‑full, and one tank is empty. You can send exactly one message to Mission Control. Which single piece of information should you send to guarantee you can determine the status of every tank?