Question

Out of 1,000 grains of sand on a beach, Kathy estimates that 40 grains are black and 760 grains are beige. Write the fraction of beige grains of sand as a decimal.

          Out of 1,000 grains of sand on a beach, Kathy estimates that 40 grains are black and 760 grains are beige. Write the fraction of beige grains of sand as a decimal.
        

Added by Gloria N.

Elementary and Intermediate Algebra
Elementary and Intermediate Algebra
Alan S. Tussy, R. David Gustafson 5th Edition
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Out of 1,000 grains of sand on a beach, Kathy estimates that 40 grains are black and 760 grains are beige. Write the fraction of beige grains of sand as a decimal.
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Transcript

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00:01 Okay, so suppose you have market of the sand containing 4 .5 times 10 to 9, right, grains.
00:15 And so, right, if there are 4 % of the brown sand, how many grains of the brown sand are in the market? so the a simply just use, right, 4 .5 times 10 to 9 times about 4%.
00:31 So that's equal to about 18 times 10 to 7.
00:42 So that's actually about 1 .8 times 10 to 8.
00:49 So that's about 0 .1 billion, right? and then b, it says now if you have 4 ppb, what is the ppb? ppb is 1 per billion...
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