Question

It is estimated that a certain beach has 5×10¹⁸ grains of sand. The beach has an area of 1.3 million square feet. How many grains of sand are there on average per square foot of sand?

Answer 1

To find the average number of grains of sand per square foot, divide the total number of grains of sand by the area of the beach.

Step-by-step explanation:

To find the average number of grains of sand per square foot, we need to divide the total number of grains of sand by the area of the beach. The beach has an area of 1.3 million square feet and 5×1018 grains of sand. To find the average, we divide the total number of grains of sand by the area:

Average grains of sand per square foot = Total grains of sand / Area of the beach

Average grains of sand per square foot = (5×1018 grains) / (1.3 million square feet)

Average grains of sand per square foot = 3.84615×10¹² grains of sand per square foot (rounded to 2 decimal places)