Suggestion for how to pose the first problem: “Imagine that someone places a large number of mirrors around the Earth so that the same sunlight hits the earth as before, but now it lands evenly spread around the earth’s surface instead of hitting the daytime half of the earth.” And, probably: “The mirrors don’t reflect any of Earth’s radiation back onto the earth.”
Suggestion for how to pose the first problem: “Imagine that someone places a large number of mirrors around the Earth so that the same sunlight hits the earth as before, but now it lands evenly spread around the earth’s surface instead of hitting the daytime half of the earth.” And, probably: “The mirrors don’t reflect any of Earth’s radiation back onto the earth.”