WAEC - Agricultural Science (2012 - No. 14)
Determine the weight of potassium in a 50 kg NPK (20:20:10) bag of fertilizer.
5.0 kg
7.0 kg
10.0 kg
20.0 kg
Uitleg
N: P: K = 20: 20: 10
The mass of potassium in 50 kg of NPK = \(\frac{10}{50}\) x 50 = 10 kg
(Total ratio = 20 + 20 + 10 = 50)