SOLUTION: The ratio of nitrogen to phosphorus to potash in a fertilizer is 7 : 5 : 3. If there are 35 kg of nitrogen, calculate the mass of the phosphorus and the mass of the potash.

Question 12145: The ratio of nitrogen to phosphorus to potash in a fertilizer is 7 : 5 : 3. If there are 35 kg of nitrogen, calculate the mass of the phosphorus and the mass of the potash.
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Set up the ratio:

You need to solve this equation:

However, the faster way to do this is to recognize that the first denominator is 5 times the numerator. Therefore, the other denominators will each be 5 times the respective numerators.

Therefore, there will be 5*5 = 25 kg phosphorus and 5 *3 = 15 kg potash.

R^2 at SCC
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