SOLUTION: If 20 percent of nitrogen combined with the other elements. If 740 kg of nitrogen did not combine, how much did combine?

Question 9902: If 20 percent of nitrogen combined with the other elements. If 740 kg of nitrogen did not combine, how much did combine?
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
NOTE: See last paragraph first. It's probably easier!! R^2

I think it might be a good idea to set up a ratio, using this information: If 20% (i.e., .20) combines, then 80% (i.e., .80) does NOT comine. Let x = amount that combines, which is what you need to find.

:

Remember means that , so

This reduces to which means that

kg

Now that I think about this, there is probably an easier way to do this, like just realizing that for every part that combines there are 4 parts that do not combine. Therefore, the amount that combines is 1/4 of the amount that does not combine, and 1/4 of 740 = 185 kg. That would have been a lot easier. Oh well. Too late now.

R^2 at SCC

RELATED QUESTIONS
Yard bird Gardening carries two kinds of fertilizer containing nitrogen and water.... (answered by stanbon)

How many gallon of plant food that is 9% nitrogen must be combine with another plant food (answered by richwmiller)

Solve Problems Using Linear Systems 16. One type of fertilizer has 30% nitrogen and a... (answered by checkley77)

Frank needs to apply a 10% liquid nitrogen solution to his rose garden. He only has a 4%... (answered by stanbon)

the ratio of the fertilizer was 5 parts nitrogen to ten parts all other ingredients. The... (answered by Boreal,ikleyn)

the ratio of the fertilizer was five parts nitrogen to ten parts all other ingredients.... (answered by ikleyn)

HOW MUCH FERTILIZER CONTAINING 8% NITROGEN SHOULD BE MIX WITH A FERTILIZER CONTAINING 12% (answered by ewatrrr)

How much fertilizer containing 8 % nitrogen should be mixed with a fertilizer containing... (answered by Alan3354)

a soil analysis of a lawn determines that 50 pounds of fertilizeer containing 20 %... (answered by josmiceli)