Question 20 of 22
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Suppose you have a bucket of sand containing 7.5 billion grains of sand ($$7.5 \times 10^9$$ grains). Most of the grains of sand are white, but there are some brown grains mixed evenly throughout.
If the concentration of brown sand is 2.0%, how many grains of brown sand are in the bucket?
brown grains
If the concentration of brown sand is 2.0 ppm, how many grains of brown sand are in the bucket?
brown grains
If the concentration of brown sand is 2.0 ppb, how many grains of brown sand are in the bucket?
brown grains