Translation of algebra in German

We bought a Sandwich and were looking for a taxi, but the streets were so crowded that we had to wait nearly one hour to find a cab. We even had to walk a few blocks in order to catch one.
In addition I felt were uncomfortable with a ten year old girl rowing our boat while we were sitting like stupid tourists there. I offered to row myself and took the girl's rudder. She was happy.
Instead, we gave him one of our Swiss chocolates as a gift so he would leave us alone. It worked: the boy went to the couple sitting next to us and tried to sell our Swiss chocolate for 2 Pesos.