The Daily Value for phosphorus is 800 mg. How many grams of phosphorus are recommended?

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Answer 1 · 2017-02-01T19:26:04

#=4/5g or 0.8g#

#1g = 1000mg#

#therefore 1mg = 1/1000g#

#800mg = 1/1000g * 800#

#=800/1000g#

#=8/10g#

#=4/5g or 0.8g#

Answer 2 · 2017-02-01T19:28:53

#0.800*g#

#"mg"# #-=# #"milligram"# #-=# #10^-3*g#.

Clearly, there are #10^3*mg*g^-1#.

And thus #(800*cancel(mg))/(10^3*cancel(mg)*g^-1)=0.800*g.#

(Because #(1)/(g^-1)=1/(1/g)=g# as required...........)