Ace the Certified Arborist Test 2025 – Branch Out and Leaf Your Mark!

Question: 1 / 400

A 50-pound bag of 20-10-5 fertilizer contains how many pounds of Potassium?

3.5

2.0

5.0

2.5

To determine how many pounds of potassium are in a 50-pound bag of 20-10-5 fertilizer, it’s important to understand the numbers that represent the percentages of the three primary nutrients: nitrogen (N), phosphorus (P), and potassium (K). The numbers in the formula indicate that the fertilizer contains 20% nitrogen, 10% phosphorus, and 5% potassium.

To find the actual amount of potassium in the bag, you multiply the total weight of the fertilizer by the percentage of potassium expressed as a decimal.

First, convert the percentage of potassium from a whole number to a decimal by dividing by 100. So, 5% becomes 0.05. Next, multiply this decimal by the total weight of the bag:

0.05 (potassium percentage) × 50 pounds (total weight) = 2.5 pounds of potassium.

This calculation shows that the correct amount of potassium in the fertilizer is 2.5 pounds. Thus, the reasoning supports the choice that correctly identifies the amount of potassium in this scenario.

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