Sanjay expects 10 000 visitors at the festival. for health and safety, there must be fewer than 0.9 visitors per square metre. if 10 000 visitors are at the festival will there be fewer than 0.9 visitors per square metre?

You didn't specify how big the festival is. so i can't find the answerbut i will try
first let's devide 10,000 by 0.9 to see how many square metres we need, to fit 10,000 people
10,000÷0.9=11,111 square meters
we need atleast 11,111 meters of land for a safe festival