SOLUTION: The Sahara Desert covers about 8.3 * 10(13) square feet. The average depth of the sand in the Sahara Desert is 200 feet. A grain of sand has a volume of approximately 1.3 * 10(-9

Algebra ->  Decimal-numbers -> SOLUTION: The Sahara Desert covers about 8.3 * 10(13) square feet. The average depth of the sand in the Sahara Desert is 200 feet. A grain of sand has a volume of approximately 1.3 * 10(-9      Log On


   

Question 89628: The Sahara Desert covers about 8.3 * 10(13) square feet.
The average depth of the sand in the Sahara Desert is 200 feet.
A grain of sand has a volume of approximately 1.3 * 10(-9) cubic feet.
Which of the follwing is the best estimate of the number of grains of sand in the Sahara Desert.
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
grains of sand = (area) * (depth) / (volume of grain)

= (8.3 * 10^(13)) * (200) / (1/3 * 10^(-9))

= 4.98 * 10^(25) grains