One housekeeper can clean a hotel room twice as fast as another one. Working together they can clean a room in 8 minutes. How long does it take for each housekeeper to clean a room?

What number produces an irrational number when multiplied by -1.25

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

Three people are traveling and need to exchange the currency of their native country for the currency of the country they are visiting. drag each exchange to the category that shows the ratio of currencies in that exchange.