A peasant had a square garden of $100 × 100$ meters divided into $100$ equal square plots. In the testament, he left to each of his $7$ male grandchildren a connected region of $10$ plots, forming each of the $7$ batches the same figure. He also left to each of his $3$ female grandchildren a connected region of $10$ plots, and each of the three regions had the same figure, but that figure was different from the boys' one. Moreover, the girl's regions didn't touch two to two, that is, a girl's plot couldn't be contiguos to another girl's one. Find the layout.
Two mirror-symmetrical figures are considered equal.
I don't know how to approach this problem, and I wanted to know if there are special strategies to get started.
I found this exercise in a question from Yahoo Answers that did not have any correct answer. I tried to answer it but I couldn't. It was in Spanish language: https://mx.answers.yahoo.com/question/index?qid=20151205035648AAm4F9l