In how many ways can an investor select four mutual funds for his investment portfolio from a recommended list of ten mutual funds?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.