Preliminary test: Iera Arrieta, mathematician

Iera Arrieta Kortajarena is a mathematics teacher in the Primary Education degree of the UPV/EHU, that is, she teaches teachers how to teach mathematics. Although his love for mathematics did not have a first glimpse, he has created the blog Maitematika and proposes mathematical exercises for leisure through social networks. He says he likes problems, but will he pass our preliminary test?