Estimate number of grains of sand in Sarah Desert?

Simple patterns, variables, the order of operations, simplification, evaluation, linear equations and graphs, etc.
chenelle00
Posts: 1
Joined: Fri Oct 02, 2009 7:46 pm
Contact:

Estimate number of grains of sand in Sarah Desert?

Postby chenelle00 » Fri Oct 02, 2009 7:58 pm

The Sarhara Desert covers about 8.3 x 10^13 square feet.
The average depth of the sand in the Sahara Desert is 200ft
A grain of sand has a volume of approximately 1.3 x 10^-9 cubic feet.

I'm told the correct answer is 10^25 but I don't know how to get that answer.

User avatar
stapel_eliz
Posts: 1733
Joined: Mon Dec 08, 2008 4:22 pm
Contact:

Postby stapel_eliz » Fri Oct 02, 2009 8:21 pm

You are given an area and a depth for the area of sand. Use these to find the volume of sand.

You are given a volume per grain, and have just computed the volume of sand. Divide to find the number of grains. :wink:


Return to “Pre-Algebra”