Please explain simple moving average with steps

Q2) The BP oil spill in the gulf has disrupted the local habitat and covered many of the indigenous wildlife in a layer of crude oil. The crude is toxic to many of regions inhabitants and can quickly destroy the local ecosystem. Therefore, it is necessary to procure sufficient cleaning materials for the near future. Since these animals will be coming from all over the gulf region for treatment, you will need to predict how much Dawn dish soap will be required to effectively treat the incoming wildlife in order to minimize the devastation to the region. Forecast the number of bottles needed for weeks 27 by using a simple moving average of two periods