We know from ticket sales that around 2000 people will be attending the festival. On average, each attendee will use the toilet twice, and each squirt of hand sanitiser is about 4.3 millilitres.
How many millilitres of hand sanitiser does the festival need?
First, calculate the number of likely trips to the toilet. There will be 2000 people taking two trips each.
We can assume each trip will include one squirt of hand sanitiser, so that means we can multiply the number of trips by the amount of hand sanitiser in one squirt. That will give us the total volume of hand sanitiser needed.
The festival will need 17200 millilitres of hand sanitiser.