Problem Solving Use groups of 2. Materials: Calculator

Watts the Problem?

Solve the following problem with your partner.

Suppose that today a worker replaces all three lightbulbs in the light fixtures of an office corridor. The worker uses three types of bulbs: One type is supposed to last 4,000 hours; another type is supposed to last 1,000 hours; and a third type is supposed to last 750 hours. If the lights are left on twenty-four hours a day and if all of the bulbs last as long as they are supposed to, on what day will all three need to be replaced at the same time?