Question

Mr. K was able to spot quite a few window washers on the skyscrapers there. He asked them how long it took to wash windows on such a building. They said that each person could wash 50 windows in 1 hour.

(How long would it take the 3 workers to wash all 1000 windows on one of the skyscrapers?)

Answer 1

6.7 hours

Explanation:

If one can do 50 then three can do 150.

So 1000÷150=6.66666666666

Hope this helps