Hello, Mladen1!
We really need more information.
The squares are to 72 as the triangles are to what?
,. . $\displaystyle \begin{array}{c}\square \\ \square\,\square \\ \square\,\square\,\square \end{array}: \;72 \;\;\;=\;\; \begin{array}{c}\Delta \,\Delta \\ \Delta\,\Delta \end{array} :\;\;\_\_\_ $
The formula could be: .$\displaystyle \text{(number of objects)} \times 12$
$\displaystyle \begin{array}{cccccc}\text{So that:} & \text{6 squares} \times 12 &=& 72 \\ \text{Then:} & \text{4 triangles} \times 12 &=& 48 \end{array}$
The formula could be: .$\displaystyle \text{(number of sides)} \times 3$
$\displaystyle \begin{array}{cccccc}\text{So that:} & \text{24 sides} \times 3 &=& 72 \\ \text{Then:} & \text{12 sides} \times 3 &=& 36 \end{array}$
There is no additional information. It states only the following:
"In all items you should look for the simplest among the most complete solutions. It is not enough to represent the correct pattern in your answer, it must also be applied in the best possible way."
Does this mean that the test is wrong and has two solutions ?