Question

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

the bag has 10kg of sand

Answer 1

It is 10 000 000 gains.

Answer 2

10000000 or
`10^(7)` grains of sand

Explanation:

The mass of a grain of sand is about
`10^(-3)` gram.

Total weight of the sand in a bag is = 10 kg = 10000 gms

Let there are n grains of sand in the bag weighing 10 kg of sand.

So weight of n grains will be = number of grains × weight of one grain = 10000

`n.(10)^(-3)=10000`

`n=(10000)/(10^(-3))=10000(10)^(3)`

n = 10000 × 1000 = 10000000

n =
`10^(7)`

Therefore answer is
`10^(7) Or 10000000` grains of sand