The ratio of nitrogen to calcium in the soil sample is 4:6. This means that for every 4 units of nitrogen, there are 6 units of calcium.
Given that there are 16 units of nitrogen present, we can set up a proportion to find the number of units of calcium:
4 units of nitrogen = 6 units of calcium
16 units of nitrogen = x units of calcium
Cross multiply to solve for x:
4 * x = 16 * 6
4x = 96
Divide both sides by 4 to find the value of x:
x = 96 / 4
x = 24
Therefore, there are 24 units of calcium present in the soil sample.
