I want to know the answer to the following question:
How much desert land is the Sahara?
All the background I'm provided with is that "Of the 9,000,000 km2 of desert land in the Sahara, an area of about 2,800,000 km2 (about 31% of the total area) receives an annual average rainfall amount of 10 mm (0.39 in) or less, while some 1,500,000 km2 (about 17% of the total area) receive an average of 5 mm or less.". Is that enough to answer the question?