The mass of a grain of sand is about 10to the -3 power gram.How how many grains of sand are in the bag of sand

Question

The mass of a grain is about 10^-3  gram.About how many grains of sand are in the bag of sand?

Answer 1

You did not state the mass of the sand in the bag.  You need to know that number, and divide it by the mass of one grain, and the result will be the number of grains in the bag.