What are these questions? Please answer and thank you!

Can someone answer this question? : )

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Determine which postulate or theorem can be used to prove that lmn =nmo