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Three-Pronged Approach: Easy rule of three Calculation with Explanation and Examples

Here you can easily solve the three-pronged approach. A distinction is made here in two types of rule of three, once the "normal" and then "inverted" rule of three. The difference you can see the problem and the examples.

Simple rule of three

Question: These questions ask for the number of x units of size B, which are in the same relation to C units of A
Size A	Size B
Example: 10 construction workers digging 22 pits in a workday. How many pits dug in the same time 5 construction workers? 10 construction workers ≅ 22 pits 5 construction workers ≅ x pits Formula: x = (C ⋅ B) / A, ie x = (5 ⋅ 22) / 10 = 11, ie 11 pits

Inverse three-pronged

Question: These questions ask for the number of x units of size B, the result with c units of A the same product
Size A	Size B
Example: 10 construction workers will need 22 days for a certain number of mines. How much time will need to download 5 construction workers? 10 construction workers ≅ 22 Days 5 construction workers ≅ x Days Formula: x = (C ⋅ A) / B, ie x = (22 ⋅ 10) / 5 = 44, ie 44 Days

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